media: staging: atomisp: use %p to print pointers

Instead of a converting pointers to unsigned long, just print
them as-is, using %p.

Fixes this warning:
	drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c:3012 ia_css_debug_pipe_graph_dump_sp_raw_copy() warn: argument 4 to %08lx specifier is cast from pointer

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