drm/i915/skl: re-enable power well support

Now that the known DMC/DC issues are fixed, let's try again and
re-enable the power well support.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447869230-21416-1-git-send-email-imre.deak@intel.com

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -1841,11 +1841,6 @@ sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv,
 	if (disable_power_well >= 0)
 		return !!disable_power_well;
 
-	if (IS_SKYLAKE(dev_priv)) {
-		DRM_DEBUG_KMS("Disabling display power well support\n");
-		return 0;
-	}
-
 	return 1;
 }