drm/i915: Make intel_uncore.h header self-contained

We're trying to resolve inter-header dependencies.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171004153327.32608-2-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/intel_uncore.h

@@ -25,6 +25,12 @@
 #ifndef __INTEL_UNCORE_H__
 #define __INTEL_UNCORE_H__
 
+#include <linux/spinlock.h>
+#include <linux/notifier.h>
+#include <linux/hrtimer.h>
+
+#include "i915_reg.h"
+
 struct drm_i915_private;
 
 enum forcewake_domain_id {