RFC: performance monitor/oprofile support for e500

[Andy Fleming]

This patch:
* Adds support for using the performance monitor counters and the 
associated interrupt, but only enables it currently for e500
* Removes the old 604 performance monitor code, suggested by various 
people on IRC
* Adds oprofile support for the e500, with potential for expansion to 
support other ppc32 processors

Andy Fleming
NCSG Open Source Team
Freescale Semiconductor, Inc

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