Add stubs for missing metadata entries

AE lock, AWB lock, crop region, test pattern mode/available modes,
hyperfocal distance, partial result count, and scene flicker.

BUG: b/33110513
TEST: CTS testCameraCaptureResultAllKeys and testKeys pass
Change-Id: I1f2e73647bdff3e4382b3186cfd7a5d4ee4e8f0c
1 file changed