drm: drop mtrr from i915

Alan Hourihane wants to set MTRR in the DDX only as otherwise
we get problems with the shared memory chipset.

From: Alan Hourihane <alanh@fairlite.demon.co.uk>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/i915_drv.c

@@ -39,8 +39,11 @@ static struct pci_device_id pciidlist[] = {
 };
 
 static struct drm_driver driver = {
+	/* don't use mtrr's here, the Xserver or user space app should
+	 * deal with them for intel hardware.
+	 */
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | DRIVER_USE_MTRR |
+	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
 	    DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
 	.load = i915_driver_load,
 	.lastclose = i915_driver_lastclose,