egl: Add support for BGRA_8888 format

* Select with BOARD_USE_BGRA_8888 flag

Conflicts:
	opengl/libs/EGL/eglApi.cpp

Change-Id: I5c57d2a6b6c0f4faf05fb1c5074625aad4b5a4c0
Merge commit 'refs/changes/03/79103/1' of http://review.cyanogenmod.org/CyanogenMod/android_frameworks_native into cm-12.0