Fix vts gfx readback test issue because clearRegion was removed in
I11f369d26e080ba49c7108957f8cf44c85146021.

Bug: 181073175
Test: VtsHalGraphicsComposerV2_2TargetTest passed
Change-Id: Ic50b968f2d2334a016d0e83a66e43e89e6d2ad80
1 file changed