drm/i915: Fix kerneldocs for intel_audio.c

Fix copy/paste fail in kerneldocs for intel_audio_codec_disable().

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114191127.16188-1-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

drivers/gpu/drm/i915/intel_audio.c

@@ -655,8 +655,8 @@ void intel_audio_codec_enable(struct intel_encoder *encoder,
 /**
  * intel_audio_codec_disable - Disable the audio codec for HD audio
  * @encoder: encoder on which to disable audio
- * @crtc_state: pointer to the old crtc state.
- * @conn_state: pointer to the old connector state.
+ * @old_crtc_state: pointer to the old crtc state.
+ * @old_conn_state: pointer to the old connector state.
  *
  * The disable sequences must be performed before disabling the transcoder or
  * port.