[PATCH] ARM: Fix discontigmem

The merge of sparsemem broke ARM discontigmem.  Fix it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 07ba77c..bfcf422 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -157,7 +157,7 @@
 config ARCH_SA1100
 	bool "SA1100-based"
 	select ISA
-	select DISCONTIGMEM
+	select ARCH_DISCONTIGMEM_ENABLE
 
 config ARCH_S3C2410
 	bool "Samsung S3C2410"