[media] davinci_vpfe: fix copy-paste errors in several comments

This removes some incorrect dv_preset references left over from copy-and-paste
errors.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Acked-by: NLad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/media/davinci_vpfe/vpfe_video.c

@@ -1016,12 +1016,12 @@ vpfe_query_dv_timings(struct file *file, void *fh,
 }
 
 /*
- * vpfe_s_dv_timings() - set dv_preset on external subdev
+ * vpfe_s_dv_timings() - set dv_timings on external subdev
  * @file: file pointer
  * @priv: void pointer
  * @timings: pointer to v4l2_dv_timings structure
  *
- * set dv_timings pointed by preset on external subdev through
+ * set dv_timings pointed by timings on external subdev through
  * v4l2_device_call_until_err, this configures amplifier also
  *
  * Return 0 on success, error code otherwise
@@ -1042,12 +1042,12 @@ vpfe_s_dv_timings(struct file *file, void *fh,
 }
 
 /*
- * vpfe_g_dv_timings() - get dv_preset which is set on external subdev
+ * vpfe_g_dv_timings() - get dv_timings which is set on external subdev
  * @file: file pointer
  * @priv: void pointer
  * @timings: pointer to v4l2_dv_timings structure
  *
- * get dv_preset which is set on external subdev through
+ * get dv_timings which is set on external subdev through
  * v4l2_subdev_call
  *
  * Return 0 on success, error code otherwise
@@ -1423,7 +1423,7 @@ static int vpfe_dqbuf(struct file *file, void *priv,
 }
 
 /*
- * vpfe_streamon() - get dv_preset which is set on external subdev
+ * vpfe_streamon() - start streaming
  * @file: file pointer
  * @priv: void pointer
  * @buf_type: enum v4l2_buf_type
@@ -1472,7 +1472,7 @@ static int vpfe_streamon(struct file *file, void *priv,
 }
 
 /*
- * vpfe_streamoff() - get dv_preset which is set on external subdev
+ * vpfe_streamoff() - stop streaming
  * @file: file pointer
  * @priv: void pointer
  * @buf_type: enum v4l2_buf_type