exynos5: Enable data cache

Things run faster when the data cache is enabled, so turn it on along with
the 'dcache' command.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

include/configs/exynos5-dt.h

@@ -33,8 +33,8 @@
 #define CONFIG_TRACE_EARLY_ADDR		0x50000000
 
 /* Keep L2 Cache Disabled */
-#define CONFIG_SYS_DCACHE_OFF
 #define CONFIG_SYS_CACHELINE_SIZE	64
+#define CONFIG_CMD_CACHE
 
 /* Enable ACE acceleration for SHA1 and SHA256 */
 #define CONFIG_EXYNOS_ACE_SHA