media: soc_camera: fix a kernel-doc markup

Remove this warning:
	drivers/media/platform/soc_camera/soc_scale_crop.c:309: warning: Cannot understand  * @icd		- soc-camera device
	 on line 309 - I thought it was a doc line

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>