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>

arch/arm/mach-pxa/spitz.c

@@ -847,7 +847,6 @@ static void __init fixup_spitz(struct machine_desc *desc,
 	sharpsl_save_param();
 	mi->nr_banks = 1;
 	mi->bank[0].start = 0xa0000000;
-	mi->bank[0].node = 0;
 	mi->bank[0].size = (64*1024*1024);
 }