dt-bindings: pinctrl: qcom,sm6350-tlmm: minor style cleanups

Drop "binding" from description (and align it with other Qualcomm
pinctrl bindings), use double quotes consistently, drop redundant
quotes and rename file to match compatible (to match coding convention).

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221017230012.47878-25-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>