PCI: apple: Convert to {en,dis}able_device() callbacks

Now that the core host-bridge infrastructure is able to give us a callback
on each device being added or removed, convert the bus-notifier hack to it.

Link: https://lore.kernel.org/r/20241204150145.800408-3-maz@kernel.org


Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>