Revert "xbmc: remove broken PRs"

This reverts commit 74283a83e647677e54418c5cee9d22d5d4cddf22.
xbmc: add PR2421

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: update to xbmc-12.0.6

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: update XVBA/VDPAU patches

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