minigbm: rockchip/mediatek: add PROTECTED flag back in

crrev.com/c/1643677 removed it, so we should add it back in.

BUG=b:141347335
TEST=GtsExoPlayerTestCases/GtsMediaTestCases

Change-Id: Ic49bd4158349da6170e8435c5c516954fe1646fa
Reviewed-on: https://chromium-review.googlesource.com/1821693
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Ready: Kazuhiro Inaba <kinaba@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
diff --git a/mediatek.c b/mediatek.c
index 4492207..6d77970 100644
--- a/mediatek.c
+++ b/mediatek.c
@@ -54,7 +54,8 @@
 	drv_add_combinations(drv, texture_source_formats, ARRAY_SIZE(texture_source_formats),
 			     &LINEAR_METADATA, BO_USE_TEXTURE_MASK);
 
-	drv_add_combination(drv, DRM_FORMAT_R8, &LINEAR_METADATA, BO_USE_SW_MASK | BO_USE_LINEAR);
+	drv_add_combination(drv, DRM_FORMAT_R8, &LINEAR_METADATA,
+			    BO_USE_SW_MASK | BO_USE_LINEAR | BO_USE_PROTECTED);
 	/*
 	 * Chrome uses DMA-buf mmap to write to YV12 buffers, which are then accessed by the
 	 * Video Encoder Accelerator (VEA). It could also support NV12 potentially in the future.