net/smc: do not allow eyecatchers in rmbe

SMC does not support eyecatchers in RMB elements,
decline peers requesting this support.

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