fix kaldi dependency in asr2

[ftshijt]

Why?

Since we changed to our own utils and steps, we do not support default Kaldi installation anymore, so better to change asr2 symlink to utils/steps of our own.

[codecov]

Codecov Report

Merging #5540 (738bc24) into master (78e5a31) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5540   +/-   ##
=======================================
  Coverage   76.75%   76.75%           
=======================================
  Files         719      719           
  Lines       66429    66429           
=======================================
  Hits        50986    50986           
  Misses      15443    15443           

Flag	Coverage Δ
test_configuration_espnet2	∅ <ø> (∅)
test_integration_espnet1	63.00% <ø> (ø)
test_integration_espnet2	50.14% <ø> (ø)
test_python_espnet1	19.10% <ø> (ø)
test_python_espnet2	52.60% <ø> (ø)
test_utils	22.19% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

📣 Codecov offers a browser extension for seamless coverage viewing on GitHub. Try it in Chrome or Firefox today!

[sw005320]

Thanks a lot.
Some scripts may use Kaldi commands, but they are not major. So, we can go with this modification to simplify the dependency.

[simpleoier]

LGTM! Thanks!