boards/common/remote: add periph_rtt
boards/common/remote: add periph_rtt

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