Start delivering modesetting driver and use it instead of the intel driver
This is hopefully a stop-gap arrangement for intel/gnome3 issues we are seeing
in 24957951

--- a/hw/xfree86/common/xf86pciBus.c	2016-11-23 13:43:11.296988337 -0800
+++ b/hw/xfree86/common/xf86pciBus.c	2016-11-29 16:01:15.432926626 -0800
@@ -1222,7 +1222,7 @@
 			/* Use fbdev/vesa driver on Oaktrail, Medfield, CDV */
 			break;
 		default:
-			driverList[0] = "intel";
+			driverList[0] = "modesetting";
 			break;
         }
         break;