selinux: make header files self-including

Include all necessary headers in header files to enable third party
applications, like LSP servers, to resolve all used symbols.

ibpkey.h: include "flask.h" for SECINITSID_UNLABELED
initial_sid_to_string.h: include <linux/stddef.h> for NULL

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/include/ibpkey.h

@@ -15,6 +15,7 @@
 #define _SELINUX_IB_PKEY_H
 
 #include <linux/types.h>
+#include "flask.h"
 
 #ifdef CONFIG_SECURITY_INFINIBAND
 void sel_ib_pkey_flush(void);

security/selinux/include/initial_sid_to_string.h

@@ -1,4 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/stddef.h>
+
 static const char *const initial_sid_to_string[] = {
 	NULL,
 	"kernel",