rdroidtest: Add module path to test case names

Sample test outputs:

//platform_testing/libraries/rdroidtest:librdroidtest_test_host ...
    PASSED  librdroidtest_test.grumble (0.0s)
    PASSED  librdroidtest_test.is_even/two (0.0s)
    ...
    PASSED  librdroidtest_test.raw::grumble (0.0s)
    PASSED  librdroidtest_test.raw::is_even/two (0.0s)
    ...

Bug: 381383246
Test: atest --host librdroidtest_test
Change-Id: I6f58298a19b3767a1925ff88be9da9a182fa76d4
1 file changed