camera2: Treat face detect mode larger than FULL as FULL

This change treats any face detect mode larger than FULL mode
in the capture result as FULL mode. So in case the face detect
mode is larger than FULL, it is assumed that the FULL mode
STATISTICS_FACE is supported in the capture result.

Bug: 111131913
Test: CTS, GCA
Change-Id: I3a6a29ce8d9d8ab66918baaea3162797e18276d2