qcacmn: Move the spectral tgt layer functionality to tgt file

If the definition of an API in umac layer is same for
both OL and DA chipsets, it is better to have a single
implementation of that API for maintainance pursposes.
tgt file is the placeholder for such APIs.

CRs-Fixed: 2151543
Change-Id: I3ae969452b10f6d81e46351a74ed9d4c3f5ea96c
4 files changed