PCI: microchip: Move IRQ functions to pcie-plda-host.c

Move IRQ related functions to common file pcie-plda-host.c

The re-use code including MSI, INTx, event interrupts and IRQ init
functions.

Link: https://lore.kernel.org/linux-pci/20240328091835.14797-17-minda.chen@starfivetech.comSigned-off-by: Minda Chen <minda.chen@starfivetech.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>

drivers/pci/controller/plda/pcie-plda.h

@@ -170,6 +170,9 @@ struct plda_event {
 	int msi_event;
 };
 
+int plda_init_interrupts(struct platform_device *pdev,
+			 struct plda_pcie_rp *port,
+			 const struct plda_event *event);
 void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
 			    phys_addr_t axi_addr, phys_addr_t pci_addr,
 			    size_t size);