pcu: Expect UL ACK/NACK after all UL data is transmitted

This is needed since osmo-pcu.git
I9b4ef7b7277efa645bdb5becf2e9f6b32c99a9b1, where a bug was fixed in
which osmo-pcu was not sending UL ACK/NACK under some conditions.

Change-Id: I1a58b3984a96b432b2cb5300fc8a4261133a4f69
1 file changed