g2: Use caf-8974 and cleanup

-Modify audio, display, media for caf-8974 (formerly caf-new)
-Add video processing
-Introduce new thermal configs
-Add sound effects (and cleanup audio)

Change-Id: I27851ef96af21edd4c3f3a27ffdf3b3bc513e71a

Conflicts:
	BoardConfigCommon.mk
	configs/media_codecs.xml
	g2.mk
	init.g2.rc