media: atomisp-mt9m114: remove dead data

It seems that, originally, the logic would allow selecting between
fine and coarse integration. However, only coarse seems to be
implemented.

Get rid of this warning:

  drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c: In function 'mt9m114_s_exposure':
  drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c:1003:6: warning: variable 'exposure_local' set but not used [-Wunused-but-set-variable]
    u16 exposure_local[3];
        ^~~~~~~~~~~~~~
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c

@@ -995,12 +995,10 @@ static long mt9m114_s_exposure(struct v4l2_subdev *sd,
 	struct mt9m114_device *dev = to_mt9m114_sensor(sd);
 	int ret = 0;
 	unsigned int coarse_integration = 0;
-	unsigned int fine_integration = 0;
 	unsigned int FLines = 0;
 	unsigned int FrameLengthLines = 0; /* ExposureTime.FrameLengthLines; */
 	unsigned int AnalogGain, DigitalGain;
 	u32 AnalogGainToWrite = 0;
-	u16 exposure_local[3];
 
 	dev_dbg(&client->dev, "%s(0x%X 0x%X 0x%X)\n", __func__,
 		    exposure->integration_time[0], exposure->gain[0],
@@ -1032,10 +1030,7 @@ static long mt9m114_s_exposure(struct v4l2_subdev *sd,
 		return -EINVAL;
 	}
 
-	/* set coarse/fine integration */
-	exposure_local[0] = REG_EXPO_COARSE;
-	exposure_local[1] = (u16)coarse_integration;
-	exposure_local[2] = (u16)fine_integration;
+	/* set coarse integration */
 	/* 3A provide real exposure time.
 		should not translate to any value here. */
 	ret = mt9m114_write_reg(client, MISENSOR_16BIT,