drm/amd/display: enable idle optimizations for beige goby

[Why&How]
MALL requires idle optimizations to be enabled. This enables MALL
feature on dcn303
Signed-off-by: NAurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: NTao Zhou <tao.zhou1@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -205,6 +205,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 		.underflow_assert_delay_us = 0xFFFFFFFF,
 		.dwb_fi_phase = -1, // -1 = disable,
 		.dmub_command_table = true,
+		.disable_idle_power_optimizations = false,
 };
 
 static const struct dc_debug_options debug_defaults_diags = {