PCI: cadence: Add MSI-X support to Endpoint driver

Implement ->set_msix() and ->get_msix() callback functions in order
to configure MSIX capability in the PCIe endpoint controller.

Add cdns_pcie_ep_send_msix_irq() to send MSIX interrupts to Host.
cdns_pcie_ep_send_msix_irq() gets the MSIX table address (virtual
address) from "struct cdns_pcie_epf" that gets initialized in
->set_bar() call back function.

[[email protected]: Re-implement MSIX support in accordance with the
 re-designed core MSI-X interfaces]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alan Douglas <[email protected]>
Signed-off-by: Kishon Vijay Abraham I <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>

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