dt-bindings: watchdog: qcom,pm8916-wdt: add parent spmi node to example

The PM8916 watchdog is part of an SPMI PMIC, which lives on an SPMI bus.

Add a parent SPMI bus node with an '#address-cells' of 2 and
'#size-cells' of 0 instead of relying on the fact that the default
number of register cells happen to match (i.e. 1 + 1).

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Link: https://lore.kernel.org/r/20231130174254.13180-1-johan+linaro@kernel.org


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