drm/i915/audio: extend audio sync rate support for DP MST

Remove the type judgement in i915_audio_component_sync_audio_rate().
Audio rate sync is necessary for all i915 digital audio now.
Signed-off-by: Libin Yang <libin.yang@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1480569439-54252-2-git-send-email-libin.yang@intel.com

drivers/gpu/drm/i915/intel_audio.c

@@ -805,9 +805,7 @@ static int i915_audio_component_sync_audio_rate(struct device *kdev, int port,
 
 	/* 1. get the pipe */
 	intel_encoder = get_saved_enc(dev_priv, port, pipe);
-	if (!intel_encoder || !intel_encoder->base.crtc ||
-	    (intel_encoder->type != INTEL_OUTPUT_HDMI &&
-	     intel_encoder->type != INTEL_OUTPUT_DP)) {
+	if (!intel_encoder || !intel_encoder->base.crtc) {
 		DRM_DEBUG_KMS("Not valid for port %c\n", port_name(port));
 		err = -ENODEV;
 		goto unlock;