Skip testCameraUPerfClass(Extension)Characteristics

... when camera id is overriden.

The tests counts with front & rear camera present in
cameraIdsUnderTest, but with camera id override the test
is run against single camera only.

Bug: 340711275
Test: atest ExtendedCameraCharacteristicsTest
Change-Id: Ia5db0ce0b719c2492e5d363119e2da77d20bf12f