Use piid-siid instead of did for mapping genericmiot responses

[rytilahti]

Some devices (like zhimi.heater.mc2) do not mirror the did back, so this converts to use the (siid, piid) combination for obtaining the property for generic miot responses.

Fixes #1619

[codecov-commenter]

Codecov Report

Merging #1620 (f1d0db3) into master (db3c7ad) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1620      +/-   ##
==========================================
- Coverage   80.19%   80.19%   -0.01%     
==========================================
  Files         159      159              
  Lines       15711    15712       +1     
  Branches     3492     3493       +1     
==========================================
  Hits        12600    12600              
  Misses       2858     2858              
- Partials      253      254       +1     

Impacted Files	Coverage Δ
miio/integrations/genericmiot/genericmiot.py	25.33% <0.00%> (-0.12%)	⬇️

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[pplucky]

Looking good now for zhimi.heater.mc2:

[S] Switch Status (heater:on): False
Device Fault (heater:fault): 0  (min: 0, max: 255, step: 1)
[S] Target Temperature (heater:target-temperature): 20 None (min: 18, max: 28, step: 1)
[S] Countdown Time (countdown:countdown-time): 0:00:00 (min: 0, max: 12, step: 1)
Temperature (environment:temperature): 19.4 None (min: -30, max: 100, step: 0)
[S] Physical Control Locked (physical-controls-locked:physical-controls-locked): False
[S] Alarm (alarm:alarm): False
[S] Brightness (indicator-light:brightness): 1 % (min: 0, max: 1, step: 1)
[S] 恒温功能使能 (private-service:hw-enable): False
用户使用时长 (private-service:use-time): 66253 None (min: 0, max: 2147483647, step: 1)
country-code (private-service:country-code): EU,欧洲 (value: 44) (from: 未知 (0), US, 美国 (1), KR,韩国 (82), EU,欧洲 (44), JP,日本 (81), RU，俄罗斯 (7), CN,中国 (86), 中国香港 (852), 中国台湾 (886), FR,法国 (33))

[rytilahti]

Great, thanks for testing and reporting @pplucky!