dt-bindings: rtc: qcom-pm8xxx: fix inconsistent example

dt-bindings: rtc: qcom-pm8xxx: fix inconsistent example

The PM8921 is an SSBI PMIC but in the binding example it is described
as being part of an SPMI PMIC while using an SSBI address.

Make the example consistent by using the sibling PM8941 SPMI PMIC
instead.

Fixes: 8138c5f0318c ("dt-bindings: rtc: qcom-pm8xxx-rtc: Add qcom pm8xxx rtc bindings")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231130173223.12794-1-johan+linaro@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>