Generic IRQ handling

[Daniel Walker]

There is a change to the generic IRQ handling in the ARM RT patch (as of
today) that should be discussed here.

I added a macro define called __ARCH_HAS_IRQ_DESC_T that removes the
generic irq_desc_t and hw_irq_controller if the architecture has them
defined already. I don't see any problems with this, and it makes ARM
integration a little easier . 

I also modified the make files so that individual files in kernel/irq/
can be compiled depending on config options. 

The full ARM RT patch is here,

ftp://source.mvista.com/pub/realtime/arm/common_arm_realtime.patch

Daniel Walker

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