Remove arch variants from ABI dump directory names

The build system finds the ABI dumps in the directories named
<TARGET_ARCH> and <TARGET_2ND_ARCH>_<TARGET_ARCH>. The ABI of the
non-generic arch variants are compared with the dumps.

Bug: 213127415
Test: ./create_reference_dumps.py
Change-Id: I3924092a75e2b9b68f5f60ece86a9d46537384f9
2 files changed