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/higmacv300.c b/drivers/net/higmacv300.c
index 1be8359..897741a 100644
--- a/drivers/net/higmacv300.c
+++ b/drivers/net/higmacv300.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2019, Linaro Limited
  */
 
+#include <cpu_func.h>
 #include <asm/io.h>
 #include <common.h>
 #include <console.h>