drm/amd/display: modify SMU_TIMEOUT macro.

[WHY]
If some SMU features are not enabled, SMU will return fail to that
message.

[HOW]
SMU_TIMEOUT macro will treat "return fail" as timeout also.
Correct the macro to only report timeout case.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Ian Chen <ian.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dm_helpers.h

@@ -170,9 +170,9 @@ bool dm_helpers_dmub_outbox_interrupt_control(struct dc_context *ctx, bool enabl
 
 void dm_helpers_smu_timeout(struct dc_context *ctx, unsigned int msg_id, unsigned int param, unsigned int timeout_us);
 
-// 0x1 = Result_OK, 0xFE = Result_UnkmownCmd
+// 0x1 = Result_OK, 0xFE = Result_UnkmownCmd, 0x0 = Status_Busy
 #define IS_SMU_TIMEOUT(result) \
-	(!(result == 0x1 || result == 0xFE))
+	(result == 0x0)
 
 int dm_helper_dmub_aux_transfer_sync(
 		struct dc_context *ctx,