msm8960: Remove obsolete flags

Change-Id: Ic85bfe945fa9f1aded84ef7e31ab27569513810e
msm8960: camera: Add flag to disable face detection

 * This works fine on JF. Make it optional for the Derp2

Change-Id: I057446865af61f62db037c9c8d980ade8fd5a698
msm8960: camera: Use hw_get_module_by_class

 * And get rid of the libhardware hack too.
 * Camera blob is renamed to "camera.vendor.msm8960.so"

Change-Id: I64df0491661963452d042ecf85d6eb9feadf1211