remove unmodified_drivers directory

Having Linux kernel drivers for 2.6 based kernels in the Xen tree is
not really needed any longer. So remove them from the tree.

In case anyone wants to look at them they are still available in
older branches.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

MAINTAINERS

@@ -421,12 +421,6 @@ F:	*/configure
 F:	*/*.ac
 F:	tools/
 
-UNMODIFIED LINUX PV DRIVERS
-M:	Jan Beulich <jbeulich@suse.com>
-S:	Obsolete
-L:	xen-devel@lists.xenproject.org
-F:	unmodified_drivers/linux-2.6/
-
 VM EVENT, MEM ACCESS and MONITOR
 M:	Tamas K Lengyel <tamas@tklengyel.com>
 R:	Alexandru Isaila <aisaila@bitdefender.com>