media: staging: atomisp: get rid of stupid statements

It makes no sense to have a do nothing statement like:

	(void)stage;

Fix those warnings:
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_params.c:3808 sh_css_param_update_isp_params() error: uninitialized symbol 'stage'.
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_sp.c:1444 sh_css_update_host2sp_offline_frame() error: uninitialized symbol 'HIVE_ADDR_host_sp_com'.
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_sp.c:1475 sh_css_update_host2sp_mipi_frame() error: uninitialized symbol 'HIVE_ADDR_host_sp_com'.
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_sp.c:1502 sh_css_update_host2sp_mipi_metadata() error: uninitialized symbol 'HIVE_ADDR_host_sp_com'.
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_sp.c:1522 sh_css_update_host2sp_num_mipi_frames() error: uninitialized symbol 'HIVE_ADDR_host_sp_com'.
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_sp.c:1541 sh_css_update_host2sp_cont_num_raw_frames() error: uninitialized symbol 'HIVE_ADDR_host_sp_com'.

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