PCI: apple: Set only available ports up

Iterating over disabled ports results in of_irq_parse_raw() parsing
the wrong "interrupt-map" entries, as it takes the status of the node
into account.

This became apparent after disabling unused PCIe ports in the Apple
Silicon device trees instead of deleting them.

Switching from for_each_child_of_node_scoped() to
for_each_available_child_of_node_scoped() solves this issue.

Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
Fixes: a0189fdfb73d ("arm64: dts: apple: t8103: Disable unused PCIe ports")
Signed-off-by: Janne Grunau <[e-mail]>
Signed-off-by: Alyssa Rosenzweig <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Tested-by: Janne Grunau <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Reviewed-by: Manivannan Sadhasivam <[e-mail]>
Acked-by: Alyssa Rosenzweig <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/asahi/[e-mail]/
Link: https://lore.kernel.org/asahi/[e-mail]/
Link: https://patch.msgid.link/[e-mail]

drivers/pci/controller/pcie-apple.c

···
 	if (ret)
 		return ret;
 
-	for_each_child_of_node_scoped(dev->of_node, of_port) {
+	for_each_available_child_of_node_scoped(dev->of_node, of_port) {
 		ret = apple_pcie_setup_port(pcie, of_port);
 		if (ret) {
 			dev_err(pcie->dev, "Port %pOF setup fail: %d\n", of_port, ret);