staging/rdma/hfi1: hfi1_ioctl remove setlink state

Set link state is not supported remove from the switch statement and allow the
default to return -ENOTTY

Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>