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/tegra2-common.h b/include/configs/tegra2-common.h
index febce35..2d36d23 100644
--- a/include/configs/tegra2-common.h
+++ b/include/configs/tegra2-common.h
@@ -31,7 +31,7 @@
 #define CONFIG_ARMCORTEXA9		/* This is an ARM V7 CPU core */
 #define CONFIG_TEGRA2			/* in a NVidia Tegra2 core */
 #define CONFIG_MACH_TEGRA_GENERIC	/* which is a Tegra generic machine */
-#define CONFIG_L2_OFF			/* No L2 cache */
+#define CONFIG_SYS_L2CACHE_OFF		/* No L2 cache */
 
 #define CONFIG_ENABLE_CORTEXA9		/* enable CPU (A9 complex) */