[m68k] RAMBAR confusion

[Nick Clifton]

Hi Nathan,

> This patch fixes things up so that
> 1) We always have a 'RAMBAR' register, this maps onto 0xc04 or 0xc05 as 
> appropriate for the particular CPU.  Thus matching the documentation.
> 
> 2) We always disassemble as RAMBAR0 and RAMBAR1, to be unambiguous.
> 
> 3) Fixes some CPUs where we had the wrong settings.
> 
> built and tested on m68k-elf, ok?

Approved - please apply.

Cheers
   Nick