splash.h: Add missing <linux/types.h>

This file has many "Linux" style types in it, add <linux/types.h>

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/splash.h b/include/splash.h
index c392237..83c6fa9 100644
--- a/include/splash.h
+++ b/include/splash.h
@@ -23,6 +23,7 @@
 #define _SPLASH_H_
 
 #include <errno.h>
+#include <linux/types.h>
 
 enum splash_storage {
 	SPLASH_STORAGE_NAND,