dt-bindings: pinctrl: qcom,sm8350-pinctrl: fix matching pin config

dt-bindings: pinctrl: qcom,sm8350-pinctrl: 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:

  sm8350-hdk.dtb: pinctrl@f100000: qup-uart3-default-state: 'oneOf' conditional failed, one must be fixed:
    'pins' is a required property
    'function' is a required property
    'rx', 'tx' do not match any of the regexes: 'pinctrl-[0-9]+'
    [[59]] is not of type 'object'

Make the schema stricter and expect such nodes to be followed with a
'-pins' suffix.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220912061746.6311-17-krzysztof.kozlowski@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>