xf86-video-nvidia: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-nvidia-legacy: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv