PCI: pciehp: Make pcie_wait_cmd() self-contained
pcie_wait_cmd() waits for the controller to finish a hotplug command. Move
the associated logic (to determine whether waiting is required and whether
we're using interrupts or polling) from pcie_write_cmd() to
pcie_wait_cmd().
No functional change.
Tested-by: Rajat Jain <rajatxjain@gmail.com> (IDT 807a controller)
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
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