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/lcd.c b/common/lcd.c
index b34754f..f8bc1ce 100644
--- a/common/lcd.c
+++ b/common/lcd.c
@@ -10,6 +10,7 @@
 #include <config.h>
 #include <common.h>
 #include <command.h>
+#include <cpu_func.h>
 #include <env_callback.h>
 #include <linux/types.h>
 #include <stdio_dev.h>