PCUIF: Allow receiving decoded RR/RLCMAC blocks in DATA REQ

This way tests can match directly on specific RLCMAC blocks, giving the
opportunity to handle different types using altsteps.
Before this, a user of the port could only receive a pcu_msg DATA_REQ
with a octetstring containing the rlcmac block, then decode it in a
second step when already in the alt step.

Related: OS#4927

Change-Id: Id8628e327d16c3a57e680e5a1ba0a2a8874f3a23
2 files changed