MODSIGN: make new include file self contained

Fixes: c8424e776b ("MODSIGN: Export module signature definitions")
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

include/linux/module_signature.h

@@ -9,6 +9,8 @@
 #ifndef _LINUX_MODULE_SIGNATURE_H
 #define _LINUX_MODULE_SIGNATURE_H
 
+#include <linux/types.h>
+
 /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
 #define MODULE_SIG_STRING "~Module signature appended~\n"