Replace LocalBus with APB as a default interface to register map

[esynr3z]

At first, introduction of some simple "native" interface and a bunch of bridges to it sounded like a fine idea. After a while I see it is not.

This forces either developers or users to create their own foo2lb bridges, which introduces additional effort and errors. Also for future features, e.g. error propagation, specification of LocalBus has to be expanded introducing even more confusion.

LB is almost APB, so it can be replaced almost seamlessly in templates. As a result, users can use pretty standard anything2apb bridges available in the wild (or in corporate repos).

Corsair will also have "batteries included" as before providing axil2apb, amm2apb, etc. out of the box. This will also help any contributor to add more standard interfaces as they have to deal with well specified and standard APB.