watchdog: Set watchdog_module in default config
systemd started to warn about used but unset environment variables.
Let us set watchdog_module=none which is used by the watchdog.service to get
rid of the following warning:
watchdog.service: Referenced but unset environment variable evaluates to an empty string: watchdog_module
(From OE-Core rev: 8f1dc796c7298373e61d806e63bc121128c1c27c)
Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Wadim Egorov