BSSGP_Emulation: Abandon "BssgpDecoded" intermediate structure

It originally seemed like a great idea to define a custom record
which aggregates the decoded BSSGP, LLC, L3 and/or SNDCP and passes
it to the individual ConnHdlr.  However, particularly with testcase
interoperability for IuPS in mind, this seems bogus.  Also, we
never really took advantage of this.

Let's now decode as far as we can decode any PDU, and then send the
decoded version of that PDU via the ports between the BSSGP_Emulation
and the ConnHdlr component.

Change-Id: I8c1082880902dd9a04935945f0293895f4d0c53a
4 files changed