CameraHal: Implementation for CAF status callbacks

1. Remove internal handling of CAMERA_MSG_FOCUS. Before we were
enabling CAMERA_MSG_FOCUS only when application calls autoFocus().
No longer needed since the CAMERA_MSG_FOCUS can come just during
preview now.

2. Add handling of unregistered focus callbacks. Since OMXCamera
will send callbacks even when we are not waiting for one, add some
handling.

Signed-off-by: Tyler Luu <tluu@ti.com>
Change-Id: I457e67b33b2561dd0b1ce3863ce807a8c27f79f6

Conflicts:

	camera/OMXCameraAdapter/OMXFocus.cpp
8 files changed