RDMA: Allow for NULL .modify_device() and .modify_port() methods
These methods don't make sense for iWARP devices, so rather than
forcing them to implement stubs, just return -ENOSYS in the core if
the hardware driver doesn't set .modify_device and/or .modify_port.
Signed-off-by: NRoland Dreier <roland@purestorage.com>
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