projects/RPi: update RPi patches

Signed-off-by: Stephan Raue <stephan@openelec.tv>
bcm2835-driver: update to bcm2835-driver-4697c2b

Signed-off-by: Stephan Raue <stephan@openelec.tv>
bcm2835-bootloader: update to bcm2835-bootloader-4697c2b

Signed-off-by: Stephan Raue <stephan@openelec.tv>