media: atomisp: make function calls cleaner

The #ifs inside the code makes confusing for reviewers and also
cause problems with smatch:
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_ioctl.c:2937:1: error: directive in argument list
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_ioctl.c:2939:1: error: directive in argument list
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_ioctl.c:2941:1: error: directive in argument list

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>