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/omap4_panda.h b/include/configs/omap4_panda.h
index b4e7f41..ab878f9 100644
--- a/include/configs/omap4_panda.h
+++ b/include/configs/omap4_panda.h
@@ -46,7 +46,7 @@
 #define CONFIG_DISPLAY_BOARDINFO	1
 
 /* Keep L2 Cache Disabled */
-#define CONFIG_L2_OFF			1
+#define CONFIG_SYS_L2CACHE_OFF			1
 
 /* Clock Defines */
 #define V_OSCK			38400000	/* Clock output from T2 */