drm/i915: Fix noatomic crtc disabling, v2.

This fixes the breakage caused by

commit eddfcbcdc27fbecb33bff098967bbdd7ca75bfa6

Author: Maarten Lankhorst <[email protected]>
Date:   Mon Jun 15 12:33:53 2015 +0200

drm/i915: Update less state during modeset.

No need to repeatedly call update_watermarks, or update_fbc. Down to a single call to update_watermarks in .crtc_enable

Tested-by(IVB): Matt Roper <[email protected]>

Add missing shared dpll disable to the noatomic disable function.

This function will be replaced by its atomic counterpart soon.

Changes since v1:
- intel_crtc->active and watermarks are fixed by a patch from Patrik Jakobsson

---

index 80a08c701574..887ba0a54352 100644
@@ -6184,6 +6184,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
 
 	intel_crtc_disable_planes(crtc, crtc->state->plane_mask);
 	dev_priv->display.crtc_disable(crtc);
+	intel_disable_shared_dpll(intel_crtc);
 
 	domains = intel_crtc->enabled_power_domains;
 	for_each_power_domain(domain, domains)

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