Revert "vm: Load evtchn module in qubes_core"

This reverts commit 26a9b77545.
Will be loaded by separate script in /etc/sysconfig/modules

Conflicts:

	common/qubes_core

common/qubes_core

@@ -16,7 +16,6 @@ start()
 	fi
 
 	modprobe evtchn
-	modprobe u2mfn
 
 	# Set permissions to /proc/xen/xenbus, so normal user can use xenstore-read
 	chmod 666 /proc/xen/xenbus