lagg: wrap lagg_port2req() into LAGG_SLOCK()

lagg: wrap lagg_port2req() into LAGG_SLOCK()

Although a port addition is coded in a sequence where first all softc
information is fulfilled and only then it is attached to the lagg, we
still need a locking primitive to guarantee cache invalidation.  Panic
observed in the wild shows that lacp_portreq() called via
lagg_port_ioctl(SIOCGLAGGPORT) immediately after port creation may see
lp->lp_psc as NULL and panic.  In the core file we will see valid data
all around.  A race via lagg_ioctl() wasn't observed but potentially
is possible.

Differential Revision:	https://reviews.freebsd.org/D43501