Make description backwards compatible with pyserial

[puddly]

See home-assistant/core#169490

Until existing integrations migrate away from constructing unique_id using the description, we need to maintain compatibility.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.79%. Comparing base (b4a65e7) to head (42a2fb1).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #81      +/-   ##
==========================================
+ Coverage   90.71%   90.79%   +0.07%     
==========================================
  Files          22       22              
  Lines        3372     3377       +5     
==========================================
+ Hits         3059     3066       +7     
+ Misses        313      311       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.