cleanup duplicated ARM interrupt code

CHANGELOG:
Cleaned up duplicated code: moved common ARM interrupt handling code from cpu specific interrupts.c files into lib_arm/interrupts.c. Patch by Andreas Engel, 21 Nov 2005

Note: there were two cases (cpu/arm720t/ and cpu/sa1100/) where the disable_interrupts function only disabled IRQ, but not FIQ. I just ignored this in the generic function in lib_arm/, which disables both IRQ and FIQ. Perhaps someone with more knowledge of ARM cores can check whether or not this is ok.

Regards,
Andreas Engel

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Hi,

please drop my patch from 21.11.2005. It doesn't work with the current git head. Attached is an updated patch.

Regards,
Andreas Engel

CHANGELOG:

Clean up duplicated code: moved common ARM interrupt handling code from cpu specific interrupts.c files into lib_arm/interrupts.c. Patch by Andreas Engel, 24 May 2005

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