Remove tests for "processing" which was never set. It attempted to

protect against multiple entries of a function that handled pending
soft interrupts.  This seems to have been a mistake made when converting
code that used simple lock in the 80321 code which got reused in armv7.

arm softintr_dispatch() already has mutexes around invoked callbacks
which should be enough.  Make the pxa2x0 code work the same way which
removes the last remaining simple lock use on arm.

ok patrick@

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