osmo-bts-trx: slow TA loop feedback
There is probably an issue of TA loop in osmo-bts-trx: if a delay between
MS and BTS is changed with a big step, e.g. from 0 to 2048 symbol periods,
then a new Timing Advance value would be changed too slow, i.e. step by
step after each measurement period => changing ToA from 0 to 2048 will take
2048 / 256 = 8 measurement periods to compensate the loop...
How to reproduce?