gralloc: Add comment about HAL_PIXEL_FORMAT_RGB_565 component order

BUG=n/a
TEST=n/a

Change-Id: I1ef69b66416202a3dd947c6b3ebd375baab4ea9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/3291695
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Tested-by: Yiwei Zhang <zzyiwei@chromium.org>
Commit-Queue: Jason Macnak <natsu@google.com>
1 file changed