kbuild: Remove CONFIG_DEVFS_FS from arch/ia64/config.in

Defining CONFIG_DEVFS_FS in two different places does not work correctly.
Nobody objected on linux-ia64, so I just removed the statements
unconditionally enabling devfs on IA64/SNI.

Pointed out by Greg Banks.

arch/ia64/config.in

@@ -76,10 +76,6 @@ if [ "$CONFIG_IA64_SGI_SN1" = "y" -o "$CONFIG_IA64_SGI_SN2" = "y" ]; then
 	bool '  Enable SGI Medusa Simulator Support' CONFIG_IA64_SGI_SN_SIM
 	bool '  Enable autotest (llsc). Option to run cache test instead of booting' \
 			CONFIG_IA64_SGI_AUTOTEST
-	define_bool CONFIG_DEVFS_FS y
-	if [ "$CONFIG_DEVFS_FS" = "y" ]; then
-	  bool '    Enable DEVFS Debug Code' CONFIG_DEVFS_DEBUG
-	fi
 	bool '  Enable protocol mode for the L1 console' CONFIG_SERIAL_SGI_L1_PROTOCOL
 	define_bool CONFIG_DISCONTIGMEM y
 	define_bool CONFIG_IA64_MCA y