x300: Fix LED configuration for TwinRX

The problem was that TwinRX has a special LED configuration (unlike most
other daughterboards): Since it has two channels, it is possible to
stream RX from both SMA ports. In that case, we would light up both LEDs
in green (which was not happening, only one LED would light up,
depending on which antenna was set last).

This fixes the problem and turns on both LEDs when both channels are
used, and both SMA ports are selected.

Note that the reason for this issue was an incorrect porting of this
code from UHD 3. There, we had separate LED ATR objects per channel.

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