selinux: update the file list in MAINTAINERS

When we removed the checkreqprot and runtime-disable functionality we
also moved the deprecation notices from Documentation/ABI/obsolete
to Documentation/ABI/removed but unfortunately forgot to update the
associated entries in the MAINTAINERS file.  This patch corrects that
problem.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202303212204.3G5mRatJ-lkp@intel.com


Signed-off-by: Paul Moore <paul@paul-moore.com>