regulator: dt-bindings: describe the PMU module of the QCA6390 package

The QCA6390 package contains discrete modules for WLAN and Bluetooth. They
are powered by the Power Management Unit (PMU) that takes inputs from the
host and provides LDO outputs. This document describes this module.

Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://msgid.link/r/20240605121450.23697-2-brgl@bgdev.pl


Signed-off-by: Mark Brown <broonie@kernel.org>