Increase startup reset wait to 2 seconds

[agners]

When connecting over a TCP serial socket (e.g. the silabs-multiprotocol add-on), the NCP reset frame can take ~1.5s to arrive after the remote reuses the socket from a previous instance. The 1s wait causes a spurious retry on every startup; bumping to 2s lets the reset land within the first attempt.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.54%. Comparing base (0d5b1b7) to head (297bf40).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #714   +/-   ##
=======================================
  Coverage   99.54%   99.54%           
=======================================
  Files          61       61           
  Lines        4147     4147           
=======================================
  Hits         4128     4128           
  Misses         19       19           

☔ 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.

[agners]

I've also noticed that you've experimented with 2s as well in #485 (see f2b9616). It does work with 1s every now and then (maybe 1 out of 10 attempts), but 2s makes it really reliable.