media: staging: atomisp: declare static vars as such

Fix a bunch of warnings:
	drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/bufq/src/bufq.c:93:23: warning: symbol 'css_queues' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/rmgr/src/rmgr_vbuf.c:27:32: warning: symbol 'handle_table' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/rmgr/src/rmgr_vbuf.c:32:30: warning: symbol 'refpool' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/rmgr/src/rmgr_vbuf.c:43:30: warning: symbol 'writepool' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/rmgr/src/rmgr_vbuf.c:54:30: warning: symbol 'hmmbufferpool' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_common/host/input_formatter.c:48:12: warning: symbol 'HIVE_IF_BIN_COPY' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_common/host/gp_timer.c:33:1: warning: symbol 'gp_timer_reg_load' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_sp.c:74:33: warning: symbol 'sh_css_sp_output' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_common/host/debug.c:32:25: warning: symbol 'debug_data' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_common/host/input_system.c:32:21: warning: symbol 'IB_BUFFER_NULL' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_common/host/input_system.c:647:24: warning: symbol 'config' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_params.c:2894:10: warning: symbol 'g_param_buffer_dequeue_count' was not declared. Should it be static?
	drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_params.c:2895:10: warning: symbol 'g_param_buffer_enqueue_count' was not declared. Should it be static?

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