drm/amd/display: Add callback for update_soc_for_wm_a for dcn303

[Why&How]
Absense of this callback causes null pointer dereference.
Add the corresponding callback in dcn303 resources.

Fixes: 443dfba0 ("drm/amd/display: fix dcn3+ bw validation soc param update sequence")
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c

@@ -1325,6 +1325,7 @@ static struct resource_funcs dcn303_res_pool_funcs = {
 		.panel_cntl_create = dcn303_panel_cntl_create,
 		.validate_bandwidth = dcn30_validate_bandwidth,
 		.calculate_wm_and_dlg = dcn30_calculate_wm_and_dlg,
+		.update_soc_for_wm_a = dcn30_update_soc_for_wm_a,
 		.populate_dml_pipes = dcn30_populate_dml_pipes_from_context,
 		.acquire_idle_pipe_for_layer = dcn20_acquire_idle_pipe_for_layer,
 		.add_stream_to_ctx = dcn30_add_stream_to_ctx,