bcm2835 is an empty package because this recipe provides a static library.
Install on target only bcm2835-tests package in which files are statically
linked to that library.
Add forgotten GPIO packages: rpi-gpio and rpio.
Change-Id: I498d2a3948ad5faf963d492bc496d4725a79e136
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>