pmdomain: imx8mp-blk-ctrl: Error out if domains are missing in DT

This driver assumes that domain->power_dev is non-NULL in its
suspend/resume path. The assumption is valid, since all the devices that
are being looked up here should be described in DT. In case they are not
described in DT, because the DT is faulty, suspend/resume attempt would
trigger NULL pointer dereference.

To avoid this failure, check whether the power_dev assignment is not NULL
right away in probe callback and fail early if it is.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20240119014807.268694-1-marex@denx.de


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>