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/common/image.c b/common/image.c
index 1c8ac2d..eb626dc 100644
--- a/common/image.c
+++ b/common/image.c
@@ -8,6 +8,7 @@
 
 #ifndef USE_HOSTCC
 #include <common.h>
+#include <cpu_func.h>
 #include <env.h>
 #include <u-boot/crc.h>
 #include <watchdog.h>