arm64: dts: qcom: msm8994-msft-lumia-octagon: add PM8994 pin properties

The bindings require that every pin configuration comes with 'function'
property.  There is also no 'drive-strength' property but
'qcom,drive-strength':

  msm8994-msft-lumia-octagon-cityman.dtb: gpios@c000: amsel-high-state: 'oneOf' conditional failed, one must be fixed:
    'drive-strength' does not match any of the regexes: 'pinctrl-[0-9]+'
    'bias-pull-up', 'drive-strength', 'function', 'pins' do not match any of the regexes: '(pinconf|-pins)$', 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220507194913.261121-9-krzysztof.kozlowski@linaro.org