kernel/selinux-testsuite: Apply patch to fix RHEL-7 compatibility
    
    In the last upstream ref bump, I failed to notice that one of the new
    commits causes the test to fail on RHEL-7 because of a missing interface
    in the policy. Temporarily apply the patch I sent upstream to fix it.
    
    Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>