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Current FAPI slot_ahead value for WLS is too low for UL, as we see these
errors:
[NR_MAC] Unexpected ULSCH HARQ PID 14 (have 3) for RNTI 0xa68e
[NR_MAC] UE a68e expected HARQ pid 3 feedback at 586. 7, but is at 587.17 instead (HARQ feedback is in the past)
Similarly to nFAPI, scale it by mu (for mu=1 => slot_ahead=2) to give
additional time, which removes these warnings at the VNF.