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/gcplus.h b/include/configs/gcplus.h
index 77d4578..b2fbca2 100644
--- a/include/configs/gcplus.h
+++ b/include/configs/gcplus.h
@@ -49,6 +49,8 @@
 #define CONFIG_GCPLUS		1	/* on an ADS GCPlus Board      */
 
 #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
 
 #define CONFIG_CMDLINE_TAG	 1	/* enable passing of ATAGs	*/
 #define CONFIG_SETUP_MEMORY_TAGS 1