arm/rpi: Enable dcache

Now that mailbox driver supports cache flush and invalidation, we can
enable dcache.

Signed-off-by: Alexander Stein <alexanders83@web.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>

include/configs/rpi-common.h

@@ -14,7 +14,6 @@
 #define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_BCM2835
 #define CONFIG_ARCH_CPU_INIT
-#define CONFIG_SYS_DCACHE_OFF
 
 #define CONFIG_SYS_TIMER_RATE		1000000
 #define CONFIG_SYS_TIMER_COUNTER	\

include/configs/rpi_2.h

@@ -10,6 +10,7 @@
 #define CONFIG_SKIP_LOWLEVEL_INIT
 #define CONFIG_BCM2836
 #define CONFIG_SYS_CACHELINE_SIZE		64
+#define CONFIG_SYS_DCACHE_OFF
 
 #include "rpi-common.h"