media: imx7-media-csi: get rid of unused var

	drivers/staging/media/imx/imx7-media-csi.c: In function 'imx7_csi_enum_mbus_code':
	drivers/staging/media/imx/imx7-media-csi.c:926:33: warning: variable 'in_cc' set but not used [-Wunused-but-set-variable]
	  const struct imx_media_pixfmt *in_cc;
	                                 ^~~~~

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>