net/smc: introduce System Enterprise ID (SEID)

SMCD version 2 defines a System Enterprise ID (short SEID).
This patch contains the SEID creation and adds the callback to
retrieve the created SEID.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/af_smc.c

@@ -2137,6 +2137,8 @@ static int __init smc_init(void)
 	if (rc)
 		return rc;
 
+	smc_ism_init();
+
 	rc = smc_pnet_init();
 	if (rc)
 		goto out_pernet_subsys;