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 <[email protected]>
Signed-off-by: Alyssa Rosenzweig <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Tested-by: Janne Grunau <[email protected]>
Reviewed-by: Rob Herring (Arm) <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Acked-by: Alyssa Rosenzweig <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/asahi/20230214-apple_dts_pcie_disable_unused-v1-0-5ea0d3ddcde3@jannau.net/
Link: https://lore.kernel.org/asahi/[email protected]/
Link: https://patch.msgid.link/[email protected]

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