ARM: 6997/1: ep93xx: increase NR_BANKS to 16 for support of 128MB RAM

I've got hands on one ts-7300 board, which is equiped with 128MB RAM in two
64MB memory chips, so it's 16 banks/8MB each. Without this patch, the bootmem
init code complains about small NR_BANKS number and only lower 64MB is
accessible.

Cc: Ryan Mallon <[e-mail]>
Acked-by: H Hartley Sweeten <[e-mail]>
Signed-off-by: Petr Štetiar <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/include/asm/setup.h

···
 /*
  * Memory map description
  */
-#define NR_BANKS 8
+#ifdef CONFIG_ARCH_EP93XX
+# define NR_BANKS 16
+#else
+# define NR_BANKS 8
+#endif
 
 struct membank {
 	phys_addr_t start;