minigbm: vgem: add a few more supported formats

minigbm: vgem: add a few more supported formats

While running Android in QEMU, I encountered a few crashes
due to unsupported formats. Add them here.

BUG=chromium:616275
TEST=Run arc-cros-gralloc in QEMU
CQ-DEPEND=CL:416291

Change-Id: Ie9a9dee0cba7c8b83592c40a3249ebcb30391346
Reviewed-on: https://chromium-review.googlesource.com/416292
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>