[RFC/Patch] 4xx idle loop

[akuster]

I was going though some old 4xx kernels I have and found an
implimentation of idle.c that had support for 4xx.  I believe the reason
it never made is out was the hacking we did to make it work.  So I
propose that we modify the kernel/Makefile to use ppc4xx_idel.o instead
of idle.o when 4xx is configured.  That way we have a clean
implimentation for 4xx idle functions and not touch the generic ppc idle
file.  The function names would not change.

Armin


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