camera2-portability: Add focus locks and touch-to-focus for API 2
This implements focus locks very simply using only camera2 API requests: the lens is locked on autoFocus() and unlocked on cancelAutoFocus(), as with the existing legacy API--backed implementation. Both passive and active focus modes ares supported, with and without positional focusing. Change-Id: I26b1866539807fd3d64189923871443056a166af
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