[viewcompiler] Add PrecompiledLayoutTest to TEST_MAPPING

PrecompiledLayoutTest makes sure that layouts generated by the viewcompiler are
equivalent to inflating from the resource XML file. We'll want to run these
tests when making changes to the viewcompiler.

Bug: 111895153
Test: atest
Change-Id: Iffa6f0f01c3f43d43feaabd1a5cd36be76650975