openpower-p9: disable host watchdog

Hostboot currently does not have IPMI support enabled on P9
systems.  Therefore, we need to disable the host watchdog.

Temporary workaround to be removed with openbmc/openbmc#993.

Change-Id: I875a3927af6ec34d2caf4c694b0a89c35a2bff74
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed