[ofw] [RFC] ib cm: export CM only interface

[Sean Hefty]

>        NTSTATUS                (*listen)(iba_cm_id *p_id, net64_t service_id,
>void *p_compare_buf,
>                                                          uint8_t compare_len,
>uint8_t compare_offset);

Listen works better for RDMA CM support using a compare buffer and mask, rather
than a buffer, len, and offset.

- Sean