Fix external camera sensor privacy tests

 The following tests fail when an external camera is attached while
running the tests:
- testOpStartsRunningAfterStartedWithSensoryPrivacyEnabled
- testOpGetsRecordedAfterStartedWithSensorPrivacyEnabled

 The cause is that CameraService will disconnect clients if sensor privacy
is enabled and camera mute is not supported (external cameras): ag/15371897

Test: atest CtsSensorPrivacyTestCases
Bug: 193550085
Change-Id: Iac5c80fd1607f8d70bd8f9c709b853830a1df90a
2 files changed