minigbm: cros_gralloc: don't fail BO_USE_SW_*_OFTEN | BO_USE_RENDERING allocation

minigbm: cros_gralloc: don't fail BO_USE_SW_*_OFTEN | BO_USE_RENDERING allocation

Some camera CTS tests pass down the following usage:

GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_SW_WRITE_OFTEN,

which we convert. Since we generally want to create a tiled buffer when
GRALLOC_USAGE_HW_TEXTURE is specified and tiled buffers are inefficient for
frequent software access, many drivers don't support this combination.

When this occurs, let's drop the BO_USE_RENDERING flag and try the allocation again
with different flags.

BUG=chromium:616275
TEST=run cts --disable-reboot --class android.hardware.camera2.cts.MultiViewTest
passes on kevin

Change-Id: Id3364edb849fe92d4710c765ed664e8aa4a4738d
Reviewed-on: https://chromium-review.googlesource.com/424318
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>