cxl: Set range param for region_res_match_cxl_range() as const

The function takes two parameters and compares them. The second parameter
should be const since no modification should be done to it.

Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

drivers/cxl/core/region.c

@@ -839,7 +839,7 @@ static int match_free_decoder(struct device *dev, const void *data)
 }
 
 static bool region_res_match_cxl_range(const struct cxl_region_params *p,
-				       struct range *range)
+				       const struct range *range)
 {
 	if (!p->res)
 		return false;