imx7d-pico has the WDOG1_B pin connected to the PMIC, so add the
wdog1 node and use the 'fsl,ext-reset-output' property to
properly describe it.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>