Rework rpp_gio initialization

Rework rpp_gio initialization

Previously, it was necessary to define indexes of various ports in
pin_map. This was error prone and some targets were buggy due to wrong
indexes specified. The new initialization procedure does not require
these indexes and hence works more reliably.

This patch also changes the IDs of ports at RPP layer to correspond to
IDs in the HAL layer. This is now needed for proper initialization and
reduces confusion.