RDMA/hfi1: Move grh_required into update_sm_ah

grh_required is intended to be a global setting where all AV's will
require a GRH, not just the sm_lid. Move the special logic to the creation
of the SM AH.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>