Remove redundant calls to onCameraAccessPrioritiesChanged.

The current implementation calls onCameraAccessPrioritiesChanged once
when there's a change in the oom adj per process, and again when there's
a change uid-wide. The second is unnecessary, as a change in uid
priority scores necessarily implies a change to process oom adj scores.

Change-Id: I6dcad316542ccdbdecd831b9dddba808583d1e44
Test: Ran testCamera2AccessCallbackInSplitMode x100.
Bug: 224887921