makes it a little easier to notice that parity checking an 8bit sram
isn't working.
Turn on scb and internal data-path parity checking for all pci chips types.
We were only doing this for ultra2 chips.
After clearing the parity interrupt status, clear the BRKADRINT. This
avoids seeing a bogus BRKADRINT interrupt after external SCB probing
once normal interrupts are enabled.