platformdrmgeneric: get the gralloc usage directly from the handle

There's no point in using a gralloc perform() op to retrieve the usage as
it is already stored in the handle like width, height, format, etc. So just
copy it to the hwc_drm_bo_t and get it directly.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robert Foss <robert.foss@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
3 files changed