mx25: Enable dcache

Now that the main i.MX features work fine with dcache enabled, enabled it by
default if CONFIG_SYS_DCACHE_OFF is not defined.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/arm926ejs/mx25/generic.c

@@ -186,6 +186,14 @@ int print_cpuinfo(void)
 }
 #endif
 
+void enable_caches(void)
+{
+#ifndef CONFIG_SYS_DCACHE_OFF
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+#endif
+}
+
 int cpu_eth_init(bd_t *bis)
 {
 #if defined(CONFIG_FEC_MXC)