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/xaeniax.h b/include/configs/xaeniax.h
index 086ca69..1632d29 100644
--- a/include/configs/xaeniax.h
+++ b/include/configs/xaeniax.h
@@ -49,6 +49,9 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * select serial console configuration
  */