Remove calls to is_selinux_enabled()

d34e407aeb5898f19d4f042b7558420bbb3a1817 removed support for
running with SELinux completely disabled. SELinux must either be
in permissive or enforcing mode now.

Remove unnecessary calls to is_selinux_enabled(). It always returns
true now.

Change-Id: Ife3156b74b13b2e590afe4accf716fc7776567e5
5 files changed