HID: intel-ish-hid: Store ishtp_cl_device instance in device

Store ishtp_cl_device pointer in device struct private data. In this
way we can get ishtp_cl_device * from device struct pointer.
Signed-off-by: NSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -466,6 +466,7 @@ static struct ishtp_cl_device *ishtp_bus_add_device(struct ishtp_device *dev,
 	}
 
 	ishtp_device_ready = true;
+	dev_set_drvdata(&device->dev, device);
 
 	return device;
 }