MAINTAINERS: repair file entry in SECURITY SUBSYSTEM

Commit 6788968 ("MAINTAINERS: update the LSM file list") adds a few
file entries to lsm-related header files. Among them, there is a reference
to include/security.h. However, security.h is located in include/linux/,
not in include/.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Repair this new file entry in the SECURITY SUBSYSTEM section.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

MAINTAINERS

@@ -19821,7 +19821,7 @@ 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/linux/security.h
 F:	include/uapi/linux/lsm.h
 F:	security/
 F:	tools/testing/selftests/lsm/