drm/amd/display: Constify dcn30_res_pool_funcs

The only usage of dcn30_res_pool_funcs is to assign its address to a
const pointer. Make it const to allow the compiler to put it in
read-only memory.
Signed-off-by: NRikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

@@ -2412,7 +2412,7 @@ static void dcn30_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw
 		dml_init_instance(&dc->current_state->bw_ctx.dml, &dcn3_0_soc, &dcn3_0_ip, DML_PROJECT_DCN30);
 }
 
-static struct resource_funcs dcn30_res_pool_funcs = {
+static const struct resource_funcs dcn30_res_pool_funcs = {
 	.destroy = dcn30_destroy_resource_pool,
 	.link_enc_create = dcn30_link_encoder_create,
 	.panel_cntl_create = dcn30_panel_cntl_create,