Add specification for yeelink.light.lamp2

[izacus]

Based on Xiaomi Mi Desk Lamp Pro which reports yeelink.light.lamp2.

Model: yeelink.light.lamp2
Hardware version: esp32
Firmware version: 2.1.7_0042

Fixes #1756

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9b17d90) 81.40% compared to head (2628b96) 81.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1859   +/-   ##
=======================================
  Coverage   81.40%   81.40%           
=======================================
  Files         193      193           
  Lines       18563    18563           
  Branches     4025     4025           
=======================================
  Hits        15111    15111           
  Misses       3171     3171           
  Partials      281      281           

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[rytilahti]

Thanks @izacus!