arm64: dts: qcom: qcs404: Add rpmcc node

Add the rpm clock controller node, to provide the low-noise baseband
clock for the USB PHYs, among other things.

Reviewed-by: Niklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>