graphics: add gralloc tests to VTS

Test: vts-tradefed run vts -m HalGraphicsAllocatorHidlTargetTest
Test: vts-tradefed run vts -m HalGraphicsMapperHidlTargetTest
Change-Id: I35e03b42e693da1bd3cfc6beac2a64771e0b8ed9
16 files changed