library: Add BSSLAP_LE_{CodecPort,Emulation}

Those two modules are analogous to BSSAP/BSSMAP CodecPort and Emulation,
but for the Lb interface (BSC-SMLC) instead of the A interface.

Change-Id: I92fd91056731abb8d3c01560f80c01c6a48a6fc9
4 files changed