[ENHANCEMENT] Map HDMI to corresponding CEC input.
I have an Apple TV and a Playstation 4 attached to my Sony TV via HDMI. By utilizing CEC, the TV can control those devices. In the plugin config UI, there are two separate inputs listed: HDMI and CEC inputs separately. However, "under the hood", they are the same physical device. There is a major difference when configuring them for use in HomeKit: If I configure HDMI inputs, the TV will switch to them, but not start the attached devices. If I configure CEC inputs, this will actually work, which is kind of a nice feature IMHO. But there is one catch:

```
[12/5/2020, 10:31:20 PM] [BraviaTVOS] TV: Changing input source to Player 1 (extInput:cec?type=player&port=1)
[12/5/2020, 10:31:29 PM] [BraviaTVOS] TV: Polling tv state
[12/5/2020, 10:31:30 PM] [BraviaTVOS] TV: {"source":"extInput:hdmi","title":"HDMI 3","uri":"extInput:hdmi?port=3"}
[12/5/2020, 10:31:32 PM] [BraviaTVOS] TV: Changing input source to Player 2 (extInput:cec?type=player&port=2)
[12/5/2020, 10:31:40 PM] [BraviaTVOS] TV: Polling tv state
[12/5/2020, 10:31:40 PM] [BraviaTVOS] TV: {"source":"extInput:hdmi","title":"HDMI 4","uri":"extInput:hdmi?port=4"}
```

While the correct input is set, the polling reports the "wrong" one. While this could in theory be a bug, I don't think it is: The actual input returned is correct. But since HomeKit just knows about the configured CEC inputs, it doesn't know what to do with the response and doesn't show the selected input source.