Bazel doesn't allow having a module and file
with the same name.

Bug: 198619163
Test: atest --host --bazel-arg=--test_output=errors libavb_host_unittest
Test: python3 test/image_handler_unittest.py
Change-Id: I6a1798665b0b0a47c7b23155edb6a7bcf51a7a22