* apply Leo's tweaks to readout_v2 which improve timing (which was previously failing badly on this firmware) - now it is barely failing, but acceptable
* raise ADC fs to max value of 4.42368 GHz (from 3.93216)
* tproc clock generated as 409.6 = 2/3 of the DAC fabric clock, instead of being ~350 and generated from the PS clock