drm/i915/gt: Use gt locals for accessing rc6

RC6 is tracked underneath the intel_gt, so use our local pointers.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Acked-by: NAndi Shyti <andi.shyti@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191115114800.725061-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/intel_gt_pm.c

@@ -62,7 +62,7 @@ static int __gt_unpark(struct intel_wakeref *wf)
 	GEM_BUG_ON(!gt->awake);
 
 	if (NEEDS_RC6_CTX_CORRUPTION_WA(i915))
-		intel_uncore_forcewake_get(&i915->uncore, FORCEWAKE_ALL);
+		intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);
 
 	intel_rps_unpark(&gt->rps);
 	i915_pmu_gt_unparked(i915);
@@ -90,8 +90,8 @@ static int __gt_park(struct intel_wakeref *wf)
 	intel_synchronize_irq(i915);
 
 	if (NEEDS_RC6_CTX_CORRUPTION_WA(i915)) {
-		intel_rc6_ctx_wa_check(&i915->gt.rc6);
-		intel_uncore_forcewake_put(&i915->uncore, FORCEWAKE_ALL);
+		intel_rc6_ctx_wa_check(&gt->rc6);
+		intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
 	}
 
 	GEM_BUG_ON(!wakeref);