[m68k] cleanup arch/cpu selection

[Nathan Sidwell]

Andreas Schwab wrote:

> 
> IMHO these should be named EF_68K_ISA_MASK, etc., since they are m68k
> specific.

I'm fine with that (I looked at some other elf header files and they didn't 
always put a prefix in).  Should the EF_M68000, EF_CFV4E & EF_CPU32 be similarly 
renamed?

nathan

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