Emulator: enable YUV format handling on emulator

Previously, emulator's gralloc cannot handle YV12 format.
Now it can and we should enable it.

Bug: 30112142
Change-Id: I504d1ba0a62ffe01565320f2852d1cc90b079eb3
(cherry picked from commit 144e707c194af26b8ce5dc8b43c4249a5fa14c13)
(cherry picked from commit db8caff5492fc5a867ae007419a5da39148290c3)
(cherry picked from commit d1679c532297bb4be13d9fe788f1ad921448b84c)