ARM: Remove DISCONTIGMEM support

Everything should now be using sparsemem rather than discontigmem, so
remove the code supporting discontigmem from ARM.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 122d999..387d2e9 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -402,13 +402,12 @@
 	size -= start & ~PAGE_MASK;
 	bank->start = PAGE_ALIGN(start);
 	bank->size  = size & PAGE_MASK;
-	bank->node  = PHYS_TO_NID(start);
 
 	/*
 	 * Check whether this memory region has non-zero size or
 	 * invalid node number.
 	 */
-	if (bank->size == 0 || bank->node >= MAX_NUMNODES)
+	if (bank->size == 0)
 		return -EINVAL;
 
 	meminfo.nr_banks++;