virtio: Put the virtio under the virtualization menu

This patch moves virtio under the virtualization menu and changes virtio
devices to not claim to only be for lguest.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index f212285..64e5148 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -440,6 +440,7 @@
 	tristate "Virtio block driver (EXPERIMENTAL)"
 	depends on EXPERIMENTAL && VIRTIO
 	---help---
-	  This is the virtual block driver for lguest.  Say Y or M.
+	  This is the virtual block driver for virtio.  It can be used with
+          lguest or QEMU based VMMs (like KVM or Xen).  Say Y or M.
 
 endif # BLK_DEV