atomisp: fix initialization when motor is not embedded to sensor

atomisp: fix initialization when motor is not embedded to sensor

BZ: 27947

When motor has own I2C controler, atomisp driver needs 2 fix:
 - Atomisp needs to create a relationship between motor and its related sensor
 - Sensor name needs to contain motor to inform upper 3A library

Change-Id: I82eabfa127091169eed2c7441f1910e7629e0140
Signed-off-by: David Cohen <david.a.cohen@intel.com>
Reviewed-on: http://android.intel.com:8080/44340
Reviewed-by: Koskinen, Ilkka <ilkka.koskinen@intel.com>
Reviewed-by: Toivonen, Tuukka <tuukka.toivonen@intel.com>
Reviewed-by: Kruger, Jozef <jozef.kruger@intel.com>
Reviewed-by: Wang, Wen W <wen.w.wang@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: Laakso, Antti <antti.laakso@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>