imx: add support for i.MX8MQ power domain controller

Add support for the power domain controller that's used on the
i.MX8MQ.  This will be needed to be able to power on the PCIe
controller.  Bindings taken from Linux, driver implementation
taken from the i.MX8 power domain controller and adjusted for
the i.MX8M SoC.

Signed-off-by: Patrick Wildt <patrick@blueri.se>
8 files changed