Add test mapping to run some libdexfile tests at presubmit.

Need to restrict tests to host since ART gtest support isn't
implemented for device yet.

The only reason art_libdexfile_tests isn't included here is that
test_per_src makes it necessary to name each source file individually.

Test: atest -p art/libdexfile/TEST_MAPPING
Bug: 147819342
Bug: 152376507
Change-Id: I61cb72dca6767bb4c7211ef0b6a5b608d7f43a40
2 files changed