Camera: Handle opChanged callback with IGNORED for shell permission

- Camera CTS assumes shell permission identity to test camera.
- An opChanged() callback can still occur during a camera session even though
the opCode remains IGNORED.

If both of the above conditions are true, the camera server shouldn't revoke the camera
access. Allow camera access if the Uid is in active state.

Test: Run FastBasicsTest with forrest
Bug: 175320666
Change-Id: I1f680337ab6f5796fe57da4d20264c224bcc50f4