drm/i915: Update DRIVER_DATE to 20181221

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/i915_drv.h

@@ -91,7 +91,7 @@
 #define DRIVER_NAME		"i915"
 #define DRIVER_DESC		"Intel Graphics"
 #define DRIVER_DATE		"20181221"
-#define DRIVER_TIMESTAMP	1545419564
+#define DRIVER_TIMESTAMP	1545422678
 
 /* Use I915_STATE_WARN(x) and I915_STATE_WARN_ON() (rather than WARN() and
  * WARN_ON()) for hw state sanity checks to check for unexpected conditions