armv7: rename cache related CONFIG flags

Replace the cache related CONFIG flags with more meaningful
names. Following are the changes:

CONFIG_L2_OFF	     -> CONFIG_SYS_L2CACHE_OFF
CONFIG_SYS_NO_ICACHE -> CONFIG_SYS_ICACHE_OFF
CONFIG_SYS_NO_DCACHE -> CONFIG_SYS_DCACHE_OFF

Signed-off-by: Aneesh V <aneesh@ti.com>
V2:
 * Changed CONFIG_L2_OFF -> CONFIG_SYS_NO_L2CACHE
V4:
 * Changed all three flags to the final names suggested as above
   and accordingly changed the commit message
diff --git a/include/configs/evb4510.h b/include/configs/evb4510.h
index fb05727..23a2efa 100644
--- a/include/configs/evb4510.h
+++ b/include/configs/evb4510.h
@@ -43,7 +43,8 @@
 #define CONFIG_ARM_THUMB	1	/* this is an ARM7TDMI	 */
 #define CONFIG_S3C4510B		1	/* it's a S3C4510B chip	 */
 #define CONFIG_EVB4510		1	/* on an EVB4510 Board	 */
-#define CONFIG_SYS_NO_CP15_CACHE
+#define CONFIG_SYS_ICACHE_OFF
+#define CONFIG_SYS_DCACHE_OFF
 
 #define CONFIG_USE_IRQ
 #define CONFIG_STACKSIZE_IRQ    (4*1024)