Transceiver52M: Allow only channel zero to set TSC value
Transceiver52M: Allow only channel zero to set TSC value

We support one TSC value per each transceiver object. Only channel
zero can set this value. Other channels can attempt to set the TSC
value, but will error if the TSC does not match the existing value.
In either case, non-zero channels do not manipulate the gloabl TSC
setting.

Signed-off-by: Thomas Tsou <96835dd8bfa718bd6447ccc87af89ae1675daeca@tsou.cc>

ttsou/osmo-trx,telenoobie/osmo-trx,kkroo/osmo-trx,kkroo/osmo-trx,kkroo/osmo-trx,osmocom/osmo-trx,pothosware/osmo-trx,telenoobie/osmo-trx,osmocom/osmo-trx,telenoobie/osmo-trx,pothosware/osmo-trx,ttsou/osmo-trx,osmocom/osmo-trx,pothosware/osmo-trx,ttsou/osmo-trx,ttsou/osmo-trx,kkroo/osmo-trx,osmocom/osmo-trx,telenoobie/osmo-trx,pothosware/osmo-trx