media: staging: atomisp: stop duplicating input format types

The same formats are defined twice with different names,
as warned:

    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5092:58: warning: mixing different enum types
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5092:58:     int enum atomisp_input_format  versus
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5092:58:     int enum ia_css_stream_format
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5112:50: warning: mixing different enum types
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5112:50:     int enum atomisp_input_format  versus
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5112:50:     int enum ia_css_stream_format
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5288:42: warning: mixing different enum types
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5288:42:     int enum atomisp_input_format  versus
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:5288:42:     int enum ia_css_stream_format
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:6179:62: warning: incorrect type in argument 2 (different address spaces)
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:6179:62:    expected void const [noderef] <asn:1>*from
    drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c:6179:62:    got unsigned short [usertype] *<noident>

Stop this enum abuse.

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