arm: clean cache management

unify arm cache management except for non standard cache as ARM7TDMI

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/csb226.h b/include/configs/csb226.h
index d9f85f0..ed18450 100644
--- a/include/configs/csb226.h
+++ b/include/configs/csb226.h
@@ -42,6 +42,10 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff      */
 					/* for timer/console/ethernet       */
+
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Hardware drivers
  */