struct serial_rs485 contains __32 fields and is exported to userspace so it
needs linux/types.h in userspace aswell.
-diff --git a/include/linux/serial.h b/include/linux/serial.h
-index 1ea8d92..fa72b39 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -10,8 +10,8 @@