pmdomain: imx: gpcv2: Simplify with scoped for each OF child loop

Use scoped for_each_child_of_node_scoped() when iterating over device
nodes to make code a bit simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240823-cleanup-h-guard-pm-domain-v1-4-8320722eaf39@linaro.org


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