atomisp: mt9e013: make sure that mutex is init before it is used

atomisp: mt9e013: make sure that mutex is init before it is used

BZ: 17272

Moved mutex_init before v4l2_i2c_subdev_init() call.

Change-Id: I522100e1ce30a6ae890386e7ee41a97af54eed8c
Signed-off-by: Kalle Lampila <kallex.lampila@intel.com>
Reviewed-on: http://android.intel.com:8080/28022
Reviewed-by: Tuominen, TeemuX <teemux.tuominen@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>