Merge changes I926887cc,I7def937e,I530f6d89,I393fc3c4 into rvc-dev

* changes:
  gralloc4-vts: Hold fence by unique_fd to avoid leakage
  gralloc4-vts: Restore Lock_YCBCR_420_888 and create Lock_YV12
  gralloc4-vts: Extract YCbCr888 data operation from Lock_YCRCB_420_SP
  gralloc4-vts: Allow YCRCB_420_SP to be unsupported in Lock_YCRCB_420_SP