enable media-caf, and enable triple buffer

Change-Id: Id0516a39011557af1f1b65d2c34b99a123ee5958
	modified:   BoardConfigCommon.mk
	modified:   overlay/frameworks/base/core/res/res/values/config.xml
Merge commit 'ef5feb6cc29f6da85a8518a91fce91d19c374c62' into HEAD