1. qseed_type in dpu_caps is unread (remove?)
2. Just like my 4.9 downstream.... `version` in `dpu_scaler_blk` is never initialized (thus these comparisons against `0x1002` and `0x2004` are bogus, let's replace with register reads)
3. Scaler version is stored both as subblock ID and feature bitmask to the SSPP block in the catalog (we have a similar duplication of information in other subblocks iirc...), is that something we can/should clean up?
4. SSPP's `get_scaler_ver` callback is never used