systemd: enable watchdog and set watchdog device to wdt2

Should only enable this for specific machines, since the watchdog
configuration is machine-dependent.

Resolves openbmc/openbmc#2427

Change-Id: I03169b5dca6dccabe5eef2b5c759fe9b075450ac
Signed-off-by: Eddie James <eajames@us.ibm.com>
2 files changed