cycle-pwm3.py: make example use real pin3 and make work on gen2
cycle-pwm3.py: make example use real pin3 and make work on gen2

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

whbruce/mraa,sergev/mraa,timrtoo/Intel,pctj101/mraa,tripzero/mraa,stefan-andritoiu/mraa,KurtE/mraa,allela-roy/mraa,Hbrinj/mraa,Hbrinj/mraa,arunlee77/mraa,andreivasiliu2211/mraa,whbruce/mraa,stefan-andritoiu/mraa,seem-sky/mraa,noahchense/mraa,alext-mkrs/mraa,stefan-andritoiu/mraa-gpio-chardev,KurtE/mraa,jontrulson/mraa,STANAPO/mraa,timrtoo/Intel,anonymouse64/mraa,STANAPO/mraa,Pillar1989/mraa,smileboywtu/mraa,seem-sky/mraa,sundw2014/mraa,alexandru-elisei/mraa,KurtE/mraa,mircea/mraa,Jon-ICS/mraa,malikabhi05/mraa,stefan-andritoiu/mraa,KurtE/mraa,nioinnovation/mraa,alex1818/mraa,w4ilun/mraa,seem-sky/mraa,smileboywtu/mraa,sergev/mraa,malikabhi05/mraa,Pillar1989/mraa,zBMNForks/mraa,timrtoo/Intel,matt-auld/mraa,neuroidss/mraa,tripzero/mraa,pctj101/mraa,Propanu/mraa,sergev/mraa,stefan-andritoiu/mraa-gpio-chardev,alexandru-elisei/mraa,timrtoo/Intel,matt-auld/mraa,noahchense/mraa,stefan-andritoiu/mraa-gpio-chardev,ProfFan/mraa,SyrianSpock/mraa,zBMNForks/mraa,w4ilun/mraa,ProfFan/mraa,yangjae/mraa,w4ilun/mraa,zBMNForks/mraa,g-vidal/mraa,w4ilun/mraa,jontrulson/mraa,yongli3/mraa,alexandru-elisei/mraa,alex1818/mraa,Propanu/mraa,sundw2014/mraa,stefan-andritoiu/mraa-gpio-chardev,nioinnovation/mraa,SyrianSpock/mraa,arfoll/mraa,pctj101/mraa,Hbrinj/mraa,noahchense/mraa,mircea/mraa,alexandru-elisei/mraa,nioinnovation/mraa,neuroidss/mraa,sundw2014/mraa,intel-iot-devkit/mraa,KurtE/mraa,yangjae/mraa,Hbrinj/mraa,ncrastanaren/mraa,petreeftime/mraa,g-vidal/mraa,seem-sky/mraa,intel-iot-devkit/mraa,alext-mkrs/mraa,Kiritoalex/mraa,damcclos/mraa,yoyojacky/mraa,Kiritoalex/mraa,intel-iot-devkit/mraa,neuroidss/mraa,damcclos/mraa,intel-iot-devkit/mraa,yangjae/mraa,spitfire88/mraa,Jon-ICS/mraa,andreivasiliu2211/mraa,ProfFan/mraa,whbruce/mraa,Propanu/mraa,arunlee77/mraa,Propanu/mraa,neuberfran/mraa,petreeftime/mraa,stefan-andritoiu/mraa,alext-mkrs/mraa,malikabhi05/mraa,SyrianSpock/mraa,arfoll/mraa,alex1818/mraa,stefan-andritoiu/mraa-gpio-chardev,whbruce/mraa,ncrastanaren/mraa,yoyojacky/mraa,Pillar1989/mraa,seem-sky/mraa,ncrastanaren/mraa,jontrulson/mraa,g-vidal/mraa,Meirtz/mraa,arfoll/mraa,allela-roy/mraa,ProfFan/mraa,petreeftime/mraa,Kiritoalex/mraa,malikabhi05/mraa,anonymouse64/mraa,matt-auld/mraa,Meirtz/mraa,stefan-andritoiu/mraa,yongli3/mraa,neuberfran/mraa,allela-roy/mraa,yoyojacky/mraa,andreivasiliu2211/mraa,g-vidal/mraa,alext-mkrs/mraa,neuberfran/mraa,arfoll/mraa,neuberfran/mraa,pctj101/mraa,Propanu/mraa,yangjae/mraa,Jon-ICS/mraa,jontrulson/mraa,spitfire88/mraa,sundw2014/mraa,andreivasiliu2211/mraa,tripzero/mraa,yongli3/mraa,arunlee77/mraa,Meirtz/mraa,spitfire88/mraa,g-vidal/mraa,neuberfran/mraa,spitfire88/mraa,petreeftime/mraa,alexandru-elisei/mraa,smileboywtu/mraa,yongli3/mraa,STANAPO/mraa,intel-iot-devkit/mraa,ncrastanaren/mraa,malikabhi05/mraa,ncrastanaren/mraa,alext-mkrs/mraa,noahchense/mraa,sergev/mraa,sergev/mraa,pctj101/mraa,timrtoo/Intel,noahchense/mraa,damcclos/mraa,mircea/mraa,jontrulson/mraa,arunlee77/mraa,sundw2014/mraa,yongli3/mraa,arfoll/mraa,anonymouse64/mraa