drm/i915: Move load time init of display/audio hooks earlier

All of this is SW only initialization so we can move them earlier. Move
the mutex init where the rest of the locks are inited. While at it also
convert dev to dev_priv.

v2:
- use the term hook instead of callback for these functions (Jani)

CC: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1458128348-15730-5-git-send-email-imre.deak@intel.com

drivers/gpu/drm/i915/intel_audio.c

@@ -564,23 +564,21 @@ void intel_audio_codec_disable(struct intel_encoder *intel_encoder)
 }
 
 /**
- * intel_init_audio - Set up chip specific audio functions
- * @dev: drm device
+ * intel_init_audio_hooks - Set up chip specific audio hooks
+ * @dev_priv: device private
  */
-void intel_init_audio(struct drm_device *dev)
+void intel_init_audio_hooks(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
-
-	if (IS_G4X(dev)) {
+	if (IS_G4X(dev_priv)) {
 		dev_priv->display.audio_codec_enable = g4x_audio_codec_enable;
 		dev_priv->display.audio_codec_disable = g4x_audio_codec_disable;
-	} else if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
+	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
 		dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
-	} else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8) {
+	} else if (IS_HASWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 8) {
 		dev_priv->display.audio_codec_enable = hsw_audio_codec_enable;
 		dev_priv->display.audio_codec_disable = hsw_audio_codec_disable;
-	} else if (HAS_PCH_SPLIT(dev)) {
+	} else if (HAS_PCH_SPLIT(dev_priv)) {
 		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
 		dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
 	}