ARM: dts: qcom: do not use underscore in node name

Align RPM requests node with DT schema by using hyphen instead of
underscore.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
[bjorn: Fixed up qcom-{apq8074,msm8974}-*.dts to match the qcom-msm8974.dtsi]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220401201035.189106-8-krzysztof.kozlowski@linaro.org