drm/amd/display: Change HDMI judgement condition.

[Why & How]
Use dc_is_hdmi_signal to determine signal type.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: JinZe.Xu <JinZe.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -4374,7 +4374,7 @@ void core_link_enable_stream(
 			dp_set_dsc_enable(pipe_ctx, true);
 	}
 
-	if (pipe_ctx->stream->signal == SIGNAL_TYPE_HDMI_TYPE_A) {
+	if (dc_is_hdmi_signal(pipe_ctx->stream->signal)) {
 		core_link_set_avmute(pipe_ctx, false);
 	}
 }