fixed rpi2 defconfig to use correct boot.cmd for rpi2 which prevented recent snapshots from booting normally.
fixed rpi2 defconfig to use correct boot.cmd for rpi2 which prevented
recent snapshots from booting normally.

jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic