drm/i915/audio: fix monitor presence indication after disable

Indicate the monitor has been disconnected on disable.

The regression has been introduced in

commit 5fad84a7530f8e7664cdc6f490cb90653fed1266
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Tue Nov 4 10:30:23 2014 +0200

    drm/i915: rewrite hsw/bdw audio codec enable/disable sequences

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86424
Cc: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_audio.c

@@ -194,6 +194,7 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder)
 	/* Invalidate ELD */
 	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 	tmp &= ~AUDIO_ELD_VALID(pipe);
+	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
 	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
 }