rdma/cm: update port reservation to support AF_IB

rdma/cm: update port reservation to support AF_IB

Update the port reservation code path to support AF_IB addresses.
Define a new port space, RDMA_PS_IB, for AF_IB addressing.

The AF_IB port space is a 64-bit service id (SID), which the
user can control through the use of a mask.  The rdma_cm
will assign values to the unmasked portions of the SID
when an rdma_cm_id is bound to an AF_IB address.

Because the IB spec divides the SID range into several regions,
a SID/mask combination may fall into one of the existing
port space ranges as defined by the RDMA CM IP Annex.  We need
to coordinate port reservation between RDMA_PS_IB and
RDMA_PS_TCP/RDMA_PS_UDP.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>