arm:exynos: Enable data cache at exynos based processors.

This patch enables the L1 data cache for systems based on Samsung
Exynos processor.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/cpu/armv7/exynos/soc.c

@@ -28,3 +28,11 @@ void reset_cpu(ulong addr)
 {
 	writel(0x1, samsung_get_base_swreset());
 }
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+void enable_caches(void)
+{
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+#endif