drm/i915/hdmi: Fix reg values for g4x_hdmi_connected

Paulo pointed out that gen4 re-used the SDVO registers for HDMI (the
separate HDMI registers where introduced with the first PCH) and so
g4x_hdmi_connected() never selected the right bit and always returned
disconnected.

Regression in

commit 8ec22b21
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri May 11 18:01:34 2012 +0100

    drm/i915/hdmi: Query the live connector status bit for G4x

Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_hdmi.c

@@ -459,15 +459,12 @@ static bool g4x_hdmi_connected(struct intel_hdmi *intel_hdmi)
 	uint32_t bit;
 
 	switch (intel_hdmi->sdvox_reg) {
-	case HDMIB:
+	case SDVOB:
 		bit = HDMIB_HOTPLUG_LIVE_STATUS;
 		break;
-	case HDMIC:
+	case SDVOC:
 		bit = HDMIC_HOTPLUG_LIVE_STATUS;
 		break;
-	case HDMID:
-		bit = HDMID_HOTPLUG_LIVE_STATUS;
-		break;
 	default:
 		bit = 0;
 		break;