MPILIB: add module description and license

This patch fixes lack of license, otherwise mpi.ko taints kernel.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: David Howells <dhowells@redhat.com>

lib/mpi/mpiutil.c

@@ -121,3 +121,6 @@ void mpi_free(MPI a)
 	kfree(a);
 }
 EXPORT_SYMBOL_GPL(mpi_free);
+
+MODULE_DESCRIPTION("Multiprecision maths library");
+MODULE_LICENSE("GPL");