PCUIF: use confirm flag in struct gsm_pcu_if_pch

In the recent PCUIF change of osmo-pcu (see Depends) a confirm flag
is added to struct gsm_pcu_if_pch. This flag tells the receiving end
(OsmoBSC or OsmoBTS) that the sending of the received MAC block has
to be confirmed towards the PCU. OsmoBTS and OsmoPCU now rely on the
conformation flag.

Let's update the BTS_and PCU testsuites accordingly.

Related: OS#5927
Depends: osmo-pcu.git Ia202862aafc1f0cb6601574ef61eb9155de11f04
Change-Id: I7017ca20ca7e0b77d0f363121e4f17280e39e8ac
4 files changed