Make USRP tune_offset configurable
UHD documentation: "A tune request instructs the implementation how to tune the RF chain."
This commit makes this configurable, from nr-softmodem, nr-uesoftmodem, lte-softmodem, and lte-uesoftmodem.
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UHD documentation: "A tune request instructs the implementation how to tune the RF chain."
This commit makes this configurable, from nr-softmodem, nr-uesoftmodem, lte-softmodem, and lte-uesoftmodem.