Camera2: Docs: Update cross-refs, aeMode, aeAntibandingMode

Unhide android.control.aeMode and android.control.availableAeModes,
which were supposed to be public all along.

This matches up to system/media commit #9fa0d90ff

Change-Id: Ibba2756dd5889344b5d0531dc6f066566776cdc1
5 files changed