* trxcon: support handling of multiple L1CTL client connections
* trxcon: use trxcon->fi as the context in L1CTL logging
* trxcon: pass fn_advance param via struct l1sched_cfg
* trxcon: pass lchan to tchh_block_dl_first_fn() for logging
* trxcon: make [l1sched_]tchh_block_dl_first_fn() static
* trxcon: make l1sched logging configurable, use trxcon->fi as prefix