hw/pvrdma: Remove max-sge command-line param

hw/pvrdma: Remove max-sge command-line param

This parameter has no effect, fix it.

The function init_dev_caps sets the front-end's max-sge to MAX_SGE. Then
it checks backend's max-sge and adjust it accordingly (we can't send
more than what the device supports).

On send and recv we need to make sure the num_sge in the WQE does not
exceeds the backend device capability.
This check is done in pvrdma level so check on rdma level is deleted.

Signed-off-by: Yuval Shaia <[email protected]>
Message-Id: <20190109194123[email protected]>
Reviewed-by: Marcel Apfelbaum<[email protected]>
Signed-off-by: Marcel Apfelbaum <[email protected]>