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

    '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: Iskren Chernev <iskren.chernev@gmail.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220912061746.6311-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>