board: sl28: fix linking with disabled watchdog

We don't have a reference to the driver used by
uclass_get_device_by_driver() in stop_recovery_watchdog(). Fix it by not
calling that function if the watchdog driver isn't enabled.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
1 file changed