arm64: dts: qcom: Add LPG to pm8916, pm8994, pmi8994 and pmi8998

Add PWM/LPG nodes to the PMICs currently supported by the binding.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Caleb Connolly <caleb@connolly.tech>
Reviewed-by: Dylan Van Assche <me@dylanvanassche.be>
Link: https://lore.kernel.org/r/20220505022706.1692554-2-bjorn.andersson@linaro.org