tests: fix test_hwtimer_spin
tests: fix test_hwtimer_spin

Actually test hwtimer_spin, not hwtimer_arch*

`hwtimer_wait` calls `hwtimer_spin` only for delays `<= 6`, that's why a
pure test_hwtimer_spin test should not pass values `>6`.
Also decrement delay in steps of 1.

lebrush/RIOT,fnack/RIOT,josephnoir/RIOT,A-Paul/RIOT,attdona/RIOT,benoit-canet/RIOT,AnonMall/RIOT,jfischer-phytec-iot/RIOT,gbarnett/RIOT,DipSwitch/RIOT,avmelnikoff/RIOT,MohmadAyman/RIOT,avmelnikoff/RIOT,BytesGalore/RIOT,zhuoshuguo/RIOT,aeneby/RIOT,zhuoshuguo/RIOT,Ell-i/RIOT,EmuxEvans/RIOT,lazytech-org/RIOT,latsku/RIOT,aeneby/RIOT,kaspar030/RIOT,jbeyerstedt/RIOT-OTA-update,alignan/RIOT,marcosalm/RIOT,x3ro/RIOT,nsol-nmsu/RIOT,RIOT-OS/RIOT,mfrey/RIOT,herrfz/RIOT-old,ros2/ros2_embedded_riot,RubikonAlpha/RIOT,neiljay/RIOT,asanka-code/RIOT,josephnoir/RIOT,beurdouche/RIOT,roberthartung/RIOT,watr-li/RIOT,toonst/RIOT,phiros/RIOT,jferreir/RIOT,brettswann/RIOT,1blankz7/RIOT,BytesGalore/RIOT,TobiasFredersdorf/RIOT,brettswann/RIOT,brettswann/RIOT,lebrush/RIOT,Lexandro92/RIOT-CoAP,ntrtrung/RIOT,neiljay/RIOT,watr-li/RIOT,kbumsik/RIOT,OlegHahm/RIOT,FrancescoErmini/RIOT,sgso/RIOT,thomaseichinger/RIOT,changbiao/RIOT,neiljay/RIOT,DipSwitch/RIOT,RIOT-OS/RIOT,dkm/RIOT,gbarnett/RIOT,cladmi/RIOT,adjih/RIOT,MarkXYang/RIOT,jhollister/RIOT,kb2ma/RIOT,asanka-code/RIOT,smlng/RIOT,gebart/RIOT,haoyangyu/RIOT,kb2ma/RIOT,LudwigKnuepfer/RIOT,mziegert/RIOT,ant9000/RIOT,adrianghc/RIOT,MarkXYang/RIOT,abkam07/RIOT,kerneltask/RIOT,phiros/RIOT,altairpearl/RIOT,malosek/RIOT,daniel-k/RIOT,watr-li/RIOT,benoit-canet/RIOT,JensErdmann/RIOT,authmillenon/RIOT,RubikonAlpha/RIOT,MarkXYang/RIOT,beurdouche/RIOT,JensErdmann/RIOT,thomaseichinger/RIOT,OlegHahm/RIOT,toonst/RIOT,dhruvvyas90/RIOT,adrianghc/RIOT,ant9000/RIOT,x3ro/RIOT,automote/RIOT,dhruvvyas90/RIOT,ros2/ros2_embedded_riot,OlegHahm/RIOT,ntrtrung/RIOT,RIOT-OS/RIOT,jremmert-phytec-iot/RIOT,MohmadAyman/RIOT,brettswann/RIOT,OTAkeys/RIOT,patkan/RIOT,BytesGalore/PetersRIOT,Lotterleben/RIOT,FrancescoErmini/RIOT,d00616/RIOT,locicontrols/RIOT,openkosmosorg/RIOT,zhuoshuguo/RIOT,kushalsingh007/RIOT,Hyungsin/RIOT-OS,biboc/RIOT,robixnai/RIOT,attdona/RIOT,Darredevil/RIOT,RubikonAlpha/RIOT,alignan/RIOT,brettswann/RIOT,beurdouche/RIOT,ros2/ros2_embedded_riot,sgso/RIOT,A-Paul/RIOT,rfswarm2/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,fnack/RIOT,herrfz/RIOT,kushalsingh007/RIOT,latsku/RIOT,alignan/RIOT,thiagohd/RIOT,arvindpdmn/RIOT,ks156/RIOT,dkm/RIOT,FrancescoErmini/RIOT,smlng/RIOT,emmanuelsearch/RIOT,authmillenon/RIOT,LudwigOrtmann/RIOT,Lotterleben/RIOT,locicontrols/RIOT,syin2/RIOT,PSHIVANI/Riot-Code,thiagohd/RIOT,sgso/RIOT,LudwigKnuepfer/RIOT,mfrey/RIOT,ant9000/RIOT,PSHIVANI/Riot-Code,OTAkeys/RIOT,sumanpanchal/RIOT,plushvoxel/RIOT,kerneltask/RIOT,marcosalm/RIOT,AnonMall/RIOT,latsku/RIOT,jasonatran/RIOT,rfswarm/RIOT,MonsterCode8000/RIOT,gautric/RIOT,gebart/RIOT,jfischer-phytec-iot/RIOT,rousselk/RIOT,kaleb-himes/RIOT,dhruvvyas90/RIOT,altairpearl/RIOT,kYc0o/RIOT,backenklee/RIOT,BytesGalore/RIOT,patkan/RIOT,haoyangyu/RIOT,msolters/RIOT,adjih/RIOT,Osblouf/RIOT,thiagohd/RIOT,Ell-i/RIOT,luciotorre/RIOT,neumodisch/RIOT,mfrey/RIOT,jasonatran/RIOT,MonsterCode8000/RIOT,stevenj/RIOT,BytesGalore/RIOT,marcosalm/RIOT,automote/RIOT,automote/RIOT,Osblouf/RIOT,bartfaizoltan/RIOT,altairpearl/RIOT,1blankz7/RIOT,nsol-nmsu/RIOT,wentaoshang/RIOT,yogo1212/RIOT,thiagohd/RIOT,backenklee/RIOT,arvindpdmn/RIOT,neumodisch/RIOT,smlng/RIOT,ximus/RIOT,bartfaizoltan/RIOT,phiros/RIOT,dailab/RIOT,miri64/RIOT,jhollister/RIOT,openkosmosorg/RIOT,jfischer-phytec-iot/RIOT,thomaseichinger/RIOT,marcosalm/RIOT,dhruvvyas90/RIOT,syin2/RIOT,yogo1212/RIOT,rfswarm2/RIOT,Lotterleben/RIOT,josephnoir/RIOT,jasonatran/RIOT,gebart/RIOT,lazytech-org/RIOT,automote/RIOT,centurysys/RIOT,jferreir/RIOT,Darredevil/RIOT,d00616/RIOT,abp719/RIOT,herrfz/RIOT,PSHIVANI/Riot-Code,stevenj/RIOT,Ell-i/RIOT,koenning/RIOT,TobiasFredersdorf/RIOT,herrfz/RIOT-old,ThanhVic/RIOT,rousselk/RIOT,shady33/RIOT,l3nko/RIOT,ntrtrung/RIOT,zhuoshuguo/RIOT,ThanhVic/RIOT,yogo1212/RIOT,AnonMall/RIOT,FrancescoErmini/RIOT,Josar/RIOT,plushvoxel/RIOT,khhhh/RIOT,khhhh/RIOT,ximus/RIOT,malosek/RIOT,centurysys/RIOT,rfswarm/RIOT,aeneby/RIOT,patkan/RIOT,miri64/RIOT,adrianghc/RIOT,adjih/RIOT,mtausig/RIOT,tfar/RIOT,A-Paul/RIOT,JensErdmann/RIOT,watr-li/RIOT,emmanuelsearch/RIOT,jremmert-phytec-iot/RIOT,changbiao/RIOT,Osblouf/RIOT,syin2/RIOT,Lexandro92/RIOT-CoAP,Yonezawa-T2/RIOT,RubikonAlpha/RIOT,mziegert/RIOT,MonsterCode8000/RIOT,LudwigOrtmann/RIOT,malosek/RIOT,kYc0o/RIOT,roberthartung/RIOT,BytesGalore/PetersRIOT,phiros/RIOT,Yonezawa-T2/RIOT,attdona/RIOT,changbiao/RIOT,abkam07/RIOT,binarylemon/RIOT,marcosalm/RIOT,malosek/RIOT,BytesGalore/PetersRIOT,gbarnett/RIOT,jhollister/RIOT,cladmi/RIOT,ThanhVic/RIOT,lebrush/RIOT,haoyangyu/RIOT,khhhh/RIOT,miri64/RIOT,patkan/RIOT,MarkXYang/RIOT,RBartz/RIOT,MarkXYang/RIOT,biboc/RIOT,jremmert-phytec-iot/RIOT,mziegert/RIOT,alex1818/RIOT,latsku/RIOT,malosek/RIOT,rajma996/RIOT,bartfaizoltan/RIOT,A-Paul/RIOT,EmuxEvans/RIOT,robixnai/RIOT,dailab/RIOT,Osblouf/RIOT,jremmert-phytec-iot/RIOT,arvindpdmn/RIOT,automote/RIOT,plushvoxel/RIOT,dailab/RIOT,basilfx/RIOT,ThanhVic/RIOT,rfuentess/RIOT,BytesGalore/PetersRIOT,msolters/RIOT,RBartz/RIOT,ThanhVic/RIOT,koenning/RIOT,robixnai/RIOT,kerneltask/RIO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a/RIOT,OTAkeys/RIOT,centurysys/RIOT,kushalsingh007/RIOT,x3ro/RIOT,Darredevil/RIOT,abkam07/RIOT,biboc/RIOT,smlng/RIOT,Ell-i/RIOT,msolters/RIOT,binarylemon/RIOT,authmillenon/RIOT,BytesGalore/PetersRIOT,immesys/RiSyn,kb2ma/RIOT,x3ro/RIOT,rfuentess/RIOT,robixnai/RIOT,rakendrathapa/RIOT,kbumsik/RIOT,wentaoshang/RIOT,immesys/RiSyn,jbeyerstedt/RIOT-OTA-update,avmelnikoff/RIOT,luciotorre/RIOT,rousselk/RIOT,haoyangyu/RIOT,d00616/RIOT,jasonatran/RIOT,basilfx/RIOT,avmelnikoff/RIOT,chris-wood/RIOT,alignan/RIOT,backenklee/RIOT,wentaoshang/RIOT,smlng/RIOT,binarylemon/RIOT,kb2ma/RIOT,TobiasFredersdorf/RIOT,LudwigOrtmann/RIOT,openkosmosorg/RIOT,emmanuelsearch/RIOT,Lotterleben/RIOT,abkam07/RIOT,luciotorre/RIOT,fnack/RIOT,luciotorre/RIOT,josephnoir/RIOT,benoit-canet/RIOT,malosek/RIOT,watr-li/RIOT,BytesGalore/RIOT,locicontrols/RIOT,jferreir/RIOT,zhuoshuguo/RIOT,Lotterleben/RIOT,sumanpanchal/RIOT,ks156/RIOT,spium/IoT-RIOT,RBartz/RIOT,adjih/RIOT,daniel-k/RIOT,tdautc19841202/RIOT,msolters/RIOT,plushvoxel/RIOT,phiros/RIOT,hamilton-mote/RIOT-OS,koenning/RIOT,khhhh/RIOT,lebrush/RIOT,Lexandro92/RIOT-CoAP,arvindpdmn/RIOT,Josar/RIOT,Osblouf/RIOT,BytesGalore/PetersRIOT,miri64/RIOT,daniel-k/RIOT,jhollister/RIOT,LudwigOrtmann/RIOT,tdautc19841202/RIOT,l3nko/RIOT,thomaseichinger/RIOT,Yonezawa-T2/RIOT,gebart/RIOT,rfswarm2/RIOT,cladmi/RIOT,ros2/ros2_embedded_riot,luciotorre/RIOT,hamilton-mote/RIOT-OS,patkan/RIOT,Josar/RIOT,JensErdmann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,altairpearl/RIOT,koenning/RIOT,bartfaizoltan/RIOT,daniel-k/RIOT,rajma996/RIOT,dkm/RIOT,locicontrols/RIOT,AnonMall/RIOT,alex1818/RIOT,Lotterleben/RIOT,jferreir/RIOT,l3nko/RIOT,Darredevil/RIOT,kaspar030/RIOT,hamilton-mote/RIOT-OS,stevenj/RIOT,ros2/ros2_embedded_riot,attdona/RIOT,gbarnett/RIOT,fnack/RIOT,abp719/RIOT,DipSwitch/RIOT,authmillenon/RIOT,benoit-canet/RIOT,kbumsik/RIOT,bartfaizoltan/RIOT,rfswarm/RIOT,kaleb-himes/RIOT,backenklee/RIOT,RubikonAlpha/RIOT,hamilton-mote/RIOT-OS,JensErdmann/RIOT,MarkXYang/RIOT,chris-wood/RIOT,jhollister/RIOT,centurysys/RIOT