Subject: enable TUN in cell_defconfig

So we can run systemsim on the blade.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Index: linus-2.6/arch/powerpc/configs/cell_defconfig
===================================================================
--- linus-2.6.orig/arch/powerpc/configs/cell_defconfig
+++ linus-2.6/arch/powerpc/configs/cell_defconfig
@@ -482,7 +482,7 @@ CONFIG_NETDEVICES=y
 # CONFIG_DUMMY is not set
 # CONFIG_BONDING is not set
 # CONFIG_EQUALIZER is not set
-# CONFIG_TUN is not set
+CONFIG_TUN=y
 
 #
 # ARCnet devices