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Draft: Improve USRP tx_sample_advance to get preamble delay closer to 0

Luis Pereira requested to merge USRP_Improve_tx_sample_advance into develop

Currently, in develop branch, when running gNB with COTS UE, the preamble delay is never 0 when UE is very close to gNB. This MR provides more accurate values to get preamble delay 0 when UE is at 1 meter of gNB for several USRP models and sampling rates. The values here were obtained by experimentation and UHD 4.4.0.0

DO NOT REVIEW, just to check CI results

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