Camera: Clear identity before access device policy manager

When cameraserver query device policy via CameraServiceProxy, the proxy
service uses identity of cameraserver. It causes SecurityException and
does not properly returns the actual query result.

Bug: 290329527
Test: Manual test with TestDPC
Change-Id: Ia02aab3276850c16a14b70c027bd03a17a601b8d
Merged-In: Ia02aab3276850c16a14b70c027bd03a17a601b8d
1 file changed