drm/i915/skl: Remove WaDisableSDEUnitClockGating

Dropping it because it is for pre-production stepping.
Signed-off-by: NArun Siluvery <arun.siluvery@linux.intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_pm.c

@@ -73,12 +73,10 @@ static void skl_init_clock_gating(struct drm_device *dev)
 
 	if (INTEL_REVID(dev) <= SKL_REVID_B0) {
 		/*
-		 * WaDisableSDEUnitClockGating:skl
 		 * WaSetGAPSunitClckGateDisable:skl
 		 */
 		I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
-			   GEN8_GAPSUNIT_CLOCK_GATE_DISABLE |
-			   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+			   GEN8_GAPSUNIT_CLOCK_GATE_DISABLE);
 
 		/* WaDisableVFUnitClockGating:skl */
 		I915_WRITE(GEN6_UCGCTL2, I915_READ(GEN6_UCGCTL2) |