drm/i915/vlv: re-enable hotplug detect based probing on VLV/BYT

Fixed with

commit 10603caa
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Aug 26 19:51:06 2013 -0300

    drm/i915: Apply the force-detect VGA w/a to Valleyview
Signed-off-by: NJesse Barnes <jbarnes@virtuosugeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_crt.c

@@ -349,9 +349,6 @@ static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 
 	DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 
-	/* FIXME: debug force function and remove */
-	ret = true;
-
 	return ret;
 }