drm/amd/display: Use helper function to check for HDMI signal

[How]
Use dc_is_hdmi_signal to determine signal type.

Signed-off-by: JinZe.Xu <[email protected]>
Reviewed-by: Charlene Liu <[email protected]>
Acked-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: unsccaptain1

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

@@ -3282,7 +3282,7 @@ void core_link_disable_stream(struct pipe_ctx *pipe_ctx)
 			dc_is_virtual_signal(pipe_ctx->stream->signal))
 		return;
 
-	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, true);
 	}