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/wepep250.h b/include/configs/wepep250.h
index e74303d..197ac0b 100644
--- a/include/configs/wepep250.h
+++ b/include/configs/wepep250.h
@@ -27,6 +27,8 @@
 #define CONFIG_WEPEP250        1        /* config for wepep250 board */
 #undef  CONFIG_USE_IRQ                  /* don't need use IRQ/FIQ    */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 /*
  * Select serial console configuration