phy: broadcom: bcm-cygnus-pcie: Simplify with scoped for each OF child loop

phy: broadcom: bcm-cygnus-pcie: 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: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20240826-phy-of-node-scope-v1-1-5b4d82582644@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>