projects/RPi/patches/linux: update RPi support patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: revert PR4642

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/RPi/linux: enable CMA support

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