minigbm: amdgpu: Add RGB565 to supported render target formats

Added DRM_FORMAT_RGB565 to the list of supported render_target_formats.

BUG=b:67914863
TEST=On Kahlee, sample Android GL application renders a red triangle correctly
using the RGB565 render target format.

Change-Id: I79c6cafebfb111bb75182fc48ce0216f1bc789fd
Reviewed-on: https://chromium-review.googlesource.com/739758
Commit-Ready: Alec Thilenius <athilenius@chromium.org>
Tested-by: Alec Thilenius <athilenius@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
1 file changed