arm64: dts: qcom: sm8450-hdk: model the PMU of the on-board wcn6855

Add nodes for the WCN6855 PMU, the WLAN and BT modules and relevant
regulators and pin functions to fully describe how the wifi is actually
wired on this platform.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241018-sc8280xp-pwrseq-v6-6-8da8310d9564@linaro.org


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