dt-bindings: mfd: qcom,spmi-pmic: Reference pm8916 wcd analog codec schema

Now that it's been converted to YAML, reference the PM8916 wcd codec
schema.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230627-topic-more_bindings-v1-6-6b4b6cd081e5@linaro.org


Signed-off-by: Lee Jones <lee@kernel.org>