add separate nHits requirements for top & bottom and for each track finding iteration in KF

[bloodyyugo]

We currently perform track finding separately for top and bottom SVT halves and do two iterations of track finding, the second with looser requirements than the first. However, there is only a single "minHits" setter in KalmanPatRecDriver...it uses the minHits to set the first iteration to minHits+1 and second to minhits and the top and bottom has same requirement.

We'd like to be able to set the minHits separately for each iteration and also for top & bottom (particularly since 2021 is missing a bottom module-5 sensor).