Switch to a fork of CM's frameworks/av

This is to get dhiru1602's codec fix as we wait on a verdict for an upstream
merge.
Use CM's frameworks/native

This brings in the dithering fixes and possibly the HWX stuff as well.
If I have the time to o things as I would like, I would rather cherry-pick
individual commits. But this is how the update is going out, so I want to have
accurate source available.
Merge branch 'aosp-4.2' of https://github.com/mateor/android into aosp-4.2

Conflicts:
	default.xml