egl/android: add support for gralloc 1.0

Patch adds gralloc 1.0 support and introduces format resolving via perform or using getformat, both android_flex_layout and android_ycbcr are supported.

v2: code and style cleanups, removed Intel specific NV12 enum changes (Tapani)

Signed-off-by: Tapani Pälli tapani.palli@intel.com