The aconfig.test.cpp.test_mode test cases modify the local flag
overrides, but was not resetting the values between tests. This meant
that
$ atest 'aconfig.test.cpp.test_mode:AconfigTest#ResetFlagValue'
would succeed, but
$ atest aconfig.test.cpp.test_mode
would fail. Fix this by calling reset_flags() as part of the per-test
setup.
Bug: N/A
Test: atest aconfig.test.cpp.test_mode
Change-Id: Ic8cffff0deb279b7ae103c05642c67230afc040f
Note a new cc_test target aconfig.test.cpp.test_mode is added instead of
reusing the old aconfig.test.cpp test target is becuase the test and
production version codegen flag lib has symbol conflict, one should only
link one at a a time.
Bug: b/291068147
Test: atest aconfig.test.cpp/aconfig.test.cpp.test_mode
Change-Id: Ifd52fd6eb7538fba90a13f0a6618a33a69b2358e
