NAND boot: change NAND loader's relocate SP to CONFIG param

So that we can set the NAND loader's relocate stack pointer
to the value other than the relocate address + 0x10000.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/freescale/mpc8313erdb/mpc8313erdb.c b/board/freescale/mpc8313erdb/mpc8313erdb.c
index 9ffd4bf..e5f62ae 100644
--- a/board/freescale/mpc8313erdb/mpc8313erdb.c
+++ b/board/freescale/mpc8313erdb/mpc8313erdb.c
@@ -140,7 +140,7 @@
 	puts("NAND boot... ");
 	init_timebase();
 	initdram(0);
-	relocate_code(CONFIG_SYS_NAND_U_BOOT_RELOC + 0x10000, (gd_t *)gd,
+	relocate_code(CONFIG_SYS_NAND_U_BOOT_RELOC_SP, (gd_t *)gd,
 	              CONFIG_SYS_NAND_U_BOOT_RELOC);
 }