cpu/stm32_common: implement low-power modes for F7
cpu/stm32_common: implement low-power modes for F7

cladmi/RIOT,mtausig/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,basilfx/RIOT,aeneby/RIOT,smlng/RIOT,authmillenon/RIOT,rfuentess/RIOT,kaspar030/RIOT,ant9000/RIOT,mtausig/RIOT,mfrey/RIOT,aeneby/RIOT,smlng/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,lazytech-org/RIOT,authmillenon/RIOT,yogo1212/RIOT,OTAkeys/RIOT,ant9000/RIOT,RIOT-OS/RIOT,miri64/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,kYc0o/RIOT,toonst/RIOT,authmillenon/RIOT,josephnoir/RIOT,cladmi/RIOT,smlng/RIOT,authmillenon/RIOT,ant9000/RIOT,toonst/RIOT,cladmi/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,basilfx/RIOT,rfuentess/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,smlng/RIOT,mtausig/RIOT,OTAkeys/RIOT,kYc0o/RIOT,miri64/RIOT,mtausig/RIOT,rfuentess/RIOT,ant9000/RIOT,OlegHahm/RIOT,mfrey/RIOT,jasonatran/RIOT,yogo1212/RIOT,josephnoir/RIOT,x3ro/RIOT,OlegHahm/RIOT,cladmi/RIOT,toonst/RIOT,cladmi/RIOT,rfuentess/RIOT,jasonatran/RIOT,basilfx/RIOT,OlegHahm/RIOT,rfuentess/RIOT,aeneby/RIOT,yogo1212/RIOT,OlegHahm/RIOT,kaspar030/RIOT,OlegHahm/RIOT,kaspar030/RIOT,toonst/RIOT,basilfx/RIOT,aeneby/RIOT,mfrey/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,aeneby/RIOT,miri64/RIOT,jasonatran/RIOT,mfrey/RIOT,x3ro/RIOT,miri64/RIOT,authmillenon/RIOT,mfrey/RIOT,jasonatran/RIOT,authmillenon/RIOT,kYc0o/RIOT,josephnoir/RIOT,yogo1212/RIOT,jasonatran/RIOT,x3ro/RIOT,ant9000/RIOT,yogo1212/RIOT,lazytech-org/RIOT,kaspar030/RIOT,toonst/RIOT,basilfx/RIOT,x3ro/RIOT,yogo1212/RIOT,josephnoir/RIOT,x3ro/RIOT,smlng/RIOT,mtausig/RIOT,miri64/RIOT,OTAkeys/RIOT