dt-bindings: pinctrl: qcom,pmic-gpio: fix matching pin config

Matching PMIC GPIOs config nodes within a '-state' node by '.*' pattern
does not work as expected because of linux,phandle in the DTB:

  arch/arm64/boot/dts/qcom/msm8994-msft-lumia-octagon-cityman.dtb: gpios@c000: divclk4-state: 'oneOf' conditional failed, one must be fixed:
    'pins' is a required property
    'function' is a required property
    'pinconf' does not match any of the regexes: 'pinctrl-[0-9]+'
    [[2]] is not of type 'object'

Make the schema stricter and expect such nodes to be either named
'pinconfig' or followed with '-pins' prefix.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220507194913.261121-3-krzysztof.kozlowski@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>