audio: eq_iir: tune: add sof_ucm2_eq_generate

Add a tuning script that turns a measured endpoint frequency
response into a pair of IIR + FIR blobs and a UCM2 include file
laid out the way alsa-ucm-conf expects. The IIR is a four-biquad
parametric (HP2 + low-Q mid PN2 + LS2 + one fine PN2 corrector)
fit stage-by-stage with fminsearch, and the residual mid-band
delta is picked up by a short minimum-phase FIR.

The script takes the DMI sys_vendor and product_name from
/sys/devices/virtual/dmi/id and an endpoint name, and produces:

  ucm2_blobs_sof/ipc4/eq_iir/<endpoint>_<vendor>_<product>_iir.{txt,bin}
  ucm2_blobs_sof/ipc4/eq_fir/<endpoint>_<vendor>_<product>_fir.{txt,bin}
  ucm2_blobs_sof/product_configs/<SYS_VENDOR>/<PRODUCT_NAME>.conf

The blob file names are lowercased and non-alphanumeric runs are
folded to underscores; the vendor and product directory names are
kept verbatim to match the existing alsa-ucm-conf tree. The .conf
file follows the alsa-ucm-conf sof/product_configs style with a
biquad summary in comments and the two
Define.PostMixer<Endpoint>Playback{Iir,Fir}Blob keys pointing at the
installed /usr/share/alsa/ucm2/blobs/sof/... paths.

Measurement input is a numeric grid with column 1 = frequency in
Hz and one or more magnitude columns in dB that are averaged.
Plain text and Excel/ODS workbooks are both accepted, dispatched
by file extension. The sof_ucm2_eq_example.{txt,xlsx} files added
in the previous commit let the script be run without external
data:

  sof_ucm2_eq_generate('example', 'example', 'speaker', \
                       'sof_ucm2_eq_example.txt');
  sof_ucm2_eq_generate('example', 'example', 'speaker', \
                       'sof_ucm2_eq_example.xlsx');

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu