twinrx: Provide power cal ID

Note that the TwinRX has a different behaviour if two or one channel are
enabled. For that reason, TwinRX requires 8 different sets of
calibration data:
- For one vs. two channels
- For channel 0 and channel 1
- For RX1 and RX2

Since every combination of these settings is possible, that results in
2^3 == 8 combinations.

The choice of RX1 vs. RX2 is encoded in the calibration key. The choice
of one vs. two channels is also encoded in the calibration key, and is
derived using an expert node.
Channel 0 and 1 are assumed symmetric, thus, the encoding for those
happens in the calibration serial.

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