media: davinci: fix two kernel-doc comments

A typo there is causing two warnings:
	drivers/media/platform/davinci/vpif_display.c:114: warning: Function parameter or member 'nplanes' not described in 'vpif_buffer_queue_setup'
	drivers/media/platform/davinci/vpif_capture.c:112: warning: Function parameter or member 'nplanes' not described in 'vpif_buffer_queue_setup'
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/davinci/vpif_capture.c

@@ -99,7 +99,7 @@ static int vpif_buffer_prepare(struct vb2_buffer *vb)
  * vpif_buffer_queue_setup : Callback function for buffer setup.
  * @vq: vb2_queue ptr
  * @nbuffers: ptr to number of buffers requested by application
- * @nplanes:: contains number of distinct video planes needed to hold a frame
+ * @nplanes: contains number of distinct video planes needed to hold a frame
  * @sizes: contains the size (in bytes) of each plane.
  * @alloc_devs: ptr to allocation context
  *

drivers/media/platform/davinci/vpif_display.c

@@ -101,7 +101,7 @@ static int vpif_buffer_prepare(struct vb2_buffer *vb)
  * vpif_buffer_queue_setup : Callback function for buffer setup.
  * @vq: vb2_queue ptr
  * @nbuffers: ptr to number of buffers requested by application
- * @nplanes:: contains number of distinct video planes needed to hold a frame
+ * @nplanes: contains number of distinct video planes needed to hold a frame
  * @sizes: contains the size (in bytes) of each plane.
  * @alloc_devs: ptr to allocation context
  *