arm64: dts: qcom: pm8550: drop PWM address/size cells

The address/size cells in PWM node are needed only if individual LEDs
are listed.  If multi-led is used, then this leads to dtc W=1 warnings:

  pm8550.dtsi:65.19-73.5: Warning (avoid_unnecessary_addr_size): /soc@0/spmi@c400000/pmic@1/pwm:
    unnecessary #address-cells/#size-cells without "ranges" or child "reg" property

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231208124332.48636-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>