IB/hns: Support compile test for hns RoCE driver

Compiling the hns RoCE driver requires ARM architecture.
In order to simplify development of IB/core, support
compile test. Add the necessary includes for that too.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>