projects/RPi/linux: enable CONFIG_UACCESS_WITH_MEMCPY

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libcec: add PR29

Signed-off-by: Stephan Raue <stephan@openelec.tv>
dvb-firmware: update to dvb-firmware-0.0.42

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