drm/amd/display: add dummy functions to smu for Renoir Silicon Diags

[Why]
Previously only dummy functions were added in Diags for FPGA.
On silicon, this would lead to a segmentation fault on silicon diags.

[How]
Check if diags silicon and if so, add dummy functions.
Signed-off-by: Sung Lee <sung.lee@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

@@ -1399,7 +1399,7 @@ static struct pp_smu_funcs *dcn21_pp_smu_create(struct dc_context *ctx)
 	if (!pp_smu)
 		return pp_smu;
 
-	if (IS_FPGA_MAXIMUS_DC(ctx->dce_environment)) {
+	if (IS_FPGA_MAXIMUS_DC(ctx->dce_environment) || IS_DIAG_DC(ctx->dce_environment)) {
 		pp_smu->ctx.ver = PP_SMU_VER_RN;
 		pp_smu->rn_funcs.get_dpm_clock_table = dummy_get_dpm_clock_table;
 		pp_smu->rn_funcs.set_wm_ranges = dummy_set_wm_ranges;