projects/RPi/patches: update RPi patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4290

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4296

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