Add RGBA_8888 support to V4L2 camera HAL

Actually returns GBR data for now, based on available formats for
RPi3 camera, but claims it's RGB.

BUG: b/31829804
TEST: test program runs, can handle format 0x1 (RGBA_8888)

Change-Id: I41c9ced5c1fa25d1254530d3d0a1446d2d514a1f
2 files changed