Clarify if DrvFif() calls are still required and, if not, remove them

PSETH2PS currently identifies and initializes up to three FIFO channels whcih are declared in the configuration and passed by name in the PSETH2PS configuration. Anway, the handles are subsequently unused in the component and the actual HAL seems to implement PFIFOs itself bypassing rcX.

Clarify/Discuss, if those config bits and intiialization calls are still required and if not, then remove them from the code.

A first test, in which I commented-out those calls seemed to have no effect on the correct function.