Revert platform and kernel gcc to aosp 4.7.

There is zero scientific evidence any of this stuff does anything
to improve the user experience an any meaningful way. On the
contrary, there is plenty of evidence non-aosp toolchains break
binaries and produce library stack errors. Therefore, all voodoo,
alchemy, witchcraft, and Santaria are hereby abolished from the
Eos project.

Change-Id: If713ee4190f15416b2843defb21c0e3882c71c3a
Add Chromecast mirror setting

Change-Id: I53a7f3aaf567a7106e747c37dc0f35ba106b8e45
Merge remote-tracking branch 'wrapped/kk4.4-f2fs' into kk4.4-f2fs