Ensure that the test binaries do not show up in `git status`:
tests/gsm44021/test_frame_csd
tests/v110/test_frame
tests/v110/test_ra1
The new naming complies to the 'tests/*/*_test' pattern in .gitignore.
Change-Id: I7bbcec2ec6887a2e6c9b37e2e5b3d9ee489654ce