mb/up/squared: Enable Vtd

Change-Id: Ie935f98f84772a53de92f0dd2d13a381f5dbaf89
Signed-off-by: Felix Singer <felix.singer@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34271
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/mainboard/up/squared/devicetree.cb

@@ -1,5 +1,7 @@
 chip soc/intel/apollolake
 
+	register "enable_vtd" = "1"
+
 	device cpu_cluster 0 on
 		device lapic 0 on end
 	end