Support AHARDWAREBUFFER_FORMAT_BLOB buffers

... by using `Buffer`s and not `ColorBuffer`s for blobs.

Bug: b/234513607
Test: launch_cvd --gpu_mode=gfxstream
Test: launch_cvd --gpu_mode=gfxstream (with WIP ANGLE)
Test: cts -m CtsNativeHardwareTestCases
Change-Id: Iab2ff38ee3e385ecd206e1d2aa6471b92985c42a
1 file changed