Make KEY_MAX_PTS_GAP_TO_ENCODER and KEY_MAX_FPS_TO_ENCODER keys public

These two keys are in public API now, keep ndk in sync.

Also replaced strings with the defined keys in media code.

bug: 80314065
Change-Id: Ic0d50c10d1f9ab464068223a1a235b95f59f4c98
7 files changed