Rework handling of Commodore Gayle chip. Avoid ugly struct casts, introduce
proper bus_space accesses and some abstraction layer. All drivers that utilised
Gayle also had to be refactored.

I tried n

Rework handling of Commodore Gayle chip. Avoid ugly struct casts, introduce
proper bus_space accesses and some abstraction layer. All drivers that utilised
Gayle also had to be refactored.

I tried not to break anything more, but this clearly needs more testing...

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Fix style (pointed out by phx).

Add driver for ELBOX FastATA 1200 Mk-III/Mk-IV (and the man page).