Add a unified s3c24x0 header file

This patch adds a unified s3c24x0 cpu header file that selects the header
file for the specific s3c24x0 cpu from the SOC and CPU configs defined in
board config file. This removes the current chain of s3c24-type #ifdef's
from the s3c24x0 code.

Signed-off-by: Kevin Morfitt <kevin.morfitt@fearnside-systems.co.uk>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/cpu/arm920t/start.S b/cpu/arm920t/start.S
index 114427a..779f192 100644
--- a/cpu/arm920t/start.S
+++ b/cpu/arm920t/start.S
@@ -131,7 +131,7 @@
 	bne	copyex
 #endif
 
-#if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410)
+#ifdef CONFIG_S3C24X0
 	/* turn off the watchdog */
 
 # if defined(CONFIG_S3C2400)
@@ -166,7 +166,7 @@
 	ldr	r0, =CLKDIVN
 	mov	r1, #3
 	str	r1, [r0]
-#endif	/* CONFIG_S3C2400 || CONFIG_S3C2410 */
+#endif	/* CONFIG_S3C24X0 */
 
 	/*
 	 * we do sys-critical inits only at reboot,