drm/xe: Mark internal gmdid mappings as const

The mapping between HW IP version and its description is const, so
mark it as such.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240116120207.1133-1-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/xe_pci.c

@@ -340,14 +340,14 @@ static const struct xe_device_desc lnl_desc = {
 __diag_pop();
 
 /* Map of GMD_ID values to graphics IP */
-static struct gmdid_map graphics_ip_map[] = {
+static const struct gmdid_map graphics_ip_map[] = {
 	{ 1270, &graphics_xelpg },
 	{ 1271, &graphics_xelpg },
 	{ 2004, &graphics_xe2 },
 };
 
 /* Map of GMD_ID values to media IP */
-static struct gmdid_map media_ip_map[] = {
+static const struct gmdid_map media_ip_map[] = {
 	{ 1300, &media_xelpmp },
 	{ 2000, &media_xe2 },
 };