The rate matching calculations are done in the system clock domain. If
the driver ticks at a different rate, the correction factor needs to be
adjusted by the rate_diff.
setup_matching() also needs to be before spa_bt_decode_buffer_process():
as follower we should use rate matching value calculated on the
*previous* cycle, because this is what driver is doing when it adjusts
it tick rate.
e446e3aac5