MAINTAINERS: drop Eric Paris from his SELinux role

MAINTAINERS: drop Eric Paris from his SELinux role

Eric Paris is an important part of SELinux history and we are all
thankful not only for his stint as maintainer, but his numerous
contributions over the years.  Unfortunately for us, Eric has moved
on to other things and hasn't contributed to the SELinux community in
several years (his last SELinux kernel commit was in 2013) so it's
time to officially drop Eric as a maintainer.

I also want to get ahead of any claims of impropriety and state that
this change has absolutely nothing to do with commit 2be4d74f2fd4 ;)

Thanks for all you've done Eric, you'll always be welcome back.

Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>