update nvidia driver to latest version
wlan-firmware: update to wlan-firmware-0.0.21

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge pull request #3263 from piotrasd/patch-4

update nvidia driver to latest version
projects/RPi/patches/linux: update RPi support patch

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