MAINTAINERS: update the LSM file list

The LSM entry was missing a number of files under include/.
Signed-off-by: Paul Moore <paul@paul-moore.com>

MAINTAINERS

@@ -19818,6 +19818,10 @@ Q:	https://patchwork.kernel.org/project/linux-security-module/list
 B:	mailto:linux-security-module@vger.kernel.org
 P:	https://github.com/LinuxSecurityModule/kernel/blob/main/README.md
 T:	git https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm.git
+F:	include/linux/lsm_audit.h
+F:	include/linux/lsm_hook_defs.h
+F:	include/linux/lsm_hooks.h
+F:	include/security.h
 F:	include/uapi/linux/lsm.h
 F:	security/
 F:	tools/testing/selftests/lsm/