camera: enable touch af
camera: enable touch af

Because of the convolution of parameter between CAF and AF, touch AF was
disabled. The final scenario is like this:

    scene mode - auto: caf on, touch af on
    scene mode - action, night, sunset, party and HDR: caf on, touch af off

Bug: 7437509
Change-Id: I7101ae8d94b8c2de4db136d53536dade33b26d70
Signed-off-by: Iliyan Malchev <b9962a40c76f189681da2829a74a26cab77021ea@google.com>

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead