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/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
index d9175f0..ba73fb9 100644
--- a/arch/arm/lib/cache-cp15.c
+++ b/arch/arm/lib/cache-cp15.c
@@ -24,7 +24,7 @@
 #include <common.h>
 #include <asm/system.h>
 
-#if !(defined(CONFIG_SYS_NO_ICACHE) && defined(CONFIG_SYS_NO_DCACHE))
+#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
 
 #if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
 #define CACHE_SETUP	0x1a
@@ -118,7 +118,7 @@
 }
 #endif
 
-#ifdef CONFIG_SYS_NO_ICACHE
+#ifdef CONFIG_SYS_ICACHE_OFF
 void icache_enable (void)
 {
 	return;
@@ -150,7 +150,7 @@
 }
 #endif
 
-#ifdef CONFIG_SYS_NO_DCACHE
+#ifdef CONFIG_SYS_DCACHE_OFF
 void dcache_enable (void)
 {
 	return;