drm/i915: Apply broader WaRsDisableCoarsePowerGating for guc also

commit 344df9809f45 ("drm/i915/skl: Disable coarse power gating up until F0")
failed to take into account that the same workaround is used in guc
when forcewake is sampled.

Wrap the condition check inside a macro and use it in both places
to fix the guc side scope.

Cc: Dave Gordon <david.s.gordon@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450286318-6854-1-git-send-email-mika.kuoppala@intel.com
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8d0d6f5..02fe081 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4713,9 +4713,7 @@
 	 * 3b: Enable Coarse Power Gating only when RC6 is enabled.
 	 * WaRsDisableCoarsePowerGating:skl,bxt - Render/Media PG need to be disabled with RC6.
 	 */
-	if (IS_BXT_REVID(dev, 0, BXT_REVID_A1) ||
-	    ((IS_SKL_GT3(dev) || IS_SKL_GT4(dev)) &&
-	     IS_SKL_REVID(dev, 0, SKL_REVID_F0)))
+	if (NEEDS_WaRsDisableCoarsePowerGating(dev))
 		I915_WRITE(GEN9_PG_ENABLE, 0);
 	else
 		I915_WRITE(GEN9_PG_ENABLE, (rc6_mask & GEN6_RC_CTL_RC6_ENABLE) ?