dt-bindings: watchdog: fsl-imx7ulp-wdt: Add i.MX94 support

Add compatible string "fsl,imx94-wdt" for the i.MX94 chip, which is
backward compatible with i.MX93. Set it to fall back to "fsl,imx93-wdt".

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250307154424.2613795-1-Frank.Li@nxp.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>