arm64: dts: qcom: sm8250-xiaomi-elish: Add qca6390-pmu node

Add qca6390-pmu node, which is used to manage power supply sequence for wifi and
bluetooth on sm8250 soc based devices.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jianhua Lu <lujianhua000@gmail.com>
Link: https://lore.kernel.org/r/20241201135716.141691-1-lujianhua000@gmail.com


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