Stability fix for powerpc openfirmware system.

Actually implement interrupt masking as appropriate for the
openfirmware drivers.

This problem was caused by the use of the X86 style of interrupt
handling introduced to the powerpc some time back. A problem may
still exist in the non-openfirmware drivers:
soft_net functions may get called when going from splhigh -> splclock
using splx when the soft functions should not be called.

Also look into SINT_CLOCK handling (where is this set).

Possibly real work can now be done...

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