- Error handlers were mis-calculating ICLR register to
  ACK on Tomatillo.
- PCI error handlers should not ACK other IRQ.
- Fix Tomatillo version comparison for PCI Timeout
  Interval setting
- Tomatillo PCI control register prefetch enable bits
  were off.
- Tomatillo revs <= 1 need bit 61 set, all others should
  have it clear.  This is in the PCI control register.
Signed-off-by: David S. Miller <davem@davemloft.net>