usb: ehci-exynos: Simplify with scoped for each OF child loop

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

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Anand Moon <linux.amoon@gmail.com>
Link: https://lore.kernel.org/r/20240821071856.2335529-1-ruanjinjie@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>