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/sni_ave.c b/drivers/net/sni_ave.c
index ba51ea5..6d333e2 100644
--- a/drivers/net/sni_ave.c
+++ b/drivers/net/sni_ave.c
@@ -5,6 +5,7 @@
  */
 
 #include <clk.h>
+#include <cpu_func.h>
 #include <dm.h>
 #include <fdt_support.h>
 #include <linux/io.h>