amd8111 LPC watchdog support

Hi all,
I hope someone here has a AMD8111 LPC bridge to test the attached patch.
E.g. pcictl pci0 list will tell you. If you have, please apply the patch
to -current, uncomment the amdpcib* entry in GENERIC and run
        wdogctl -k -p1 amdpcib0
after reboot. System should continue to run. Now enter DDB and after a
second, the system should reboot.

Joerg

amdpcib.c.diff
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