Bug: 23003511 CTS: AudioManagerTest#testSoundEffects failing

Fix the failures in test cases caused by not having appops turned on
for write_settings operation. This is done by changing the existing
test class to that of InstrumentationTest and calling the util
methods to enable and disable appops during setup and teardown.

Change-Id: I67223a2b8c6f2877a0e67e0db6cf49abcca2ebdb
1 file changed