boards/stm32: introduce common timer config with TIM2
boards/stm32: introduce common timer config with TIM2

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