Move machine specific code to board at s3c64xx (v2)

Move machine specific code to smdk6400.
Some board use OneNAND instead of NAND.

Some register MP0_CS_CFG[5:0] are controled by both h/w and s/w.
So it's better to use macro instead of hard-coded value.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
diff --git a/board/samsung/smdk6400/lowlevel_init.S b/board/samsung/smdk6400/lowlevel_init.S
index e0119a7..47f72f6 100644
--- a/board/samsung/smdk6400/lowlevel_init.S
+++ b/board/samsung/smdk6400/lowlevel_init.S
@@ -104,6 +104,13 @@
 	bl nand_asm_init
 #endif
 
+	/* Memory subsystem address 0x7e00f120 */
+	ldr	r0, =ELFIN_MEM_SYS_CFG
+
+	/* Xm0CSn2 = NFCON CS0, Xm0CSn3 = NFCON CS1 */
+	mov	r1, #S3C64XX_MEM_SYS_CFG_NAND
+	str	r1, [r0]
+
 	bl	mem_ctrl_asm_init
 
 /* Wakeup support. Don't know if it's going to be used, untested. */