gralloc4-vts: Restore Lock_YCBCR_420_888 and create Lock_YV12

The patch adds back Lock_YCBCR_420_888 and also creates Lock_YV12 to
verify planner format with the checks on subsampling, chroma step, and
CbCr offsets.

Bug: 150461327
Bug: 152510209
Test: VtsHalGraphicsMapperV4_0Target

Change-Id: I7def937e9b65e99569a3dc2230e7e929477c06eb