Publish SSB NR ARFCN value so that user doesn't have
to go look in the gNB log themselves to find the SSB value.
In order to publish the SSB NR ARFCN, we start lteenb
with a dummy gNB configuration and parse the gNB log to get
the SSB NR ARFCN computed by Amarisoft (if user has set the
SSB NR ARFCN we just use their value).