common: Move ARM cache operations out of common.h

These functions are CPU-related and do not use driver model. Move them to
cpu_func.h

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/pcnet.c b/drivers/net/pcnet.c
index eda6743..b4ad11d 100644
--- a/drivers/net/pcnet.c
+++ b/drivers/net/pcnet.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <malloc.h>
 #include <net.h>
 #include <netdev.h>