Changes to gt64260 interrupt support code

[mod+linuxppc-dev@MissionCriticalLinux.com]

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Please introduce these changes into the linuxppc
sources in order that the existing gt64260 interrupt
support code be usable on platforms other than the
Galileo Eval Board.

The current gt64260 interrupt support code forces
use of particular Linux irqs (starting from 0) for
particular GT64260 interrupt sources.  These changes
allow use of that support code in other platforms and
(of particular interest in my situation) in combination
with other interrupt controllers (like the elegant
and flexible 8259) that also want to map *their*
interrupt sources to the Linux irqs starting at 0...


Regards,
          Michael O'Donnell
        Mission Critical Linux



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