microblaze: add security initcalls

The security subsystem has its own initcalls, which
need support in vmlinux.lds.S.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/vmlinux.lds.S

@@ -132,6 +132,8 @@ SECTIONS {
 		__con_initcall_end = .;
 	}
 
+	SECURITY_INIT
+
 	__init_end_before_initramfs = .;
 
 	.init.ramfs ALIGN(4096) : {