PXE ISR: Force polling on select hardware WORKAROUND

Like 2fe3a7bd, certain Dell machines (OptiPlex 990) state interrupts
should work but effectively don't.  Force polling.

Reported-by: Alexander Perlis <aperlis@math.lsu.edu>
Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
1 file changed