trxcon: make l1sched logging configurable, use trxcon->fi as prefix

This change makes it possible to configure l1sched related logging:

* l1sched_logging_init() allows to configure logging categories for
  common and data messages (by default, DLGLOBAL is used);
* struct l1sched_cfg allows to configure a logging prefix to be
  used in l1sched messges (by default, 'l1sched[0x%p] is used)'.

Let's use osmo_fsm_inst_name(trxcon->fi) as the logging prefix.

Change-Id: I26da1a506b02502a3a6a887533c35fb09c13c429
Related: OS#5599, OS#3761
---
M src/host/trxcon/include/osmocom/bb/l1sched/Makefile.am
M src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
A src/host/trxcon/include/osmocom/bb/l1sched/logging.h
M src/host/trxcon/include/osmocom/bb/trxcon/trxcon.h
M src/host/trxcon/src/sched_clck.c
M src/host/trxcon/src/sched_lchan_common.c
M src/host/trxcon/src/sched_lchan_pdtch.c
M src/host/trxcon/src/sched_lchan_rach.c
M src/host/trxcon/src/sched_lchan_sch.c
M src/host/trxcon/src/sched_lchan_tchf.c
M src/host/trxcon/src/sched_lchan_tchh.c
M src/host/trxcon/src/sched_lchan_xcch.c
M src/host/trxcon/src/sched_mframe.c
M src/host/trxcon/src/sched_prim.c
M src/host/trxcon/src/sched_trx.c
M src/host/trxcon/src/trxcon.c
16 files changed, 253 insertions(+), 201 deletions(-)