PCI: designware: Make get_msi_addr() return phys_addr_t, not u32

Make get_msi_addr() return phys_addr_t, not u32.  This allows the MSI
target address to be above 4GB for 64bit or PAE systems.

No functional change for the current 32bit platform users as phys_addr_t
maps to u32 for them.

[bhelgaas: changelog]
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c
index e71da99..3cf55cd 100644
--- a/drivers/pci/host/pci-keystone-dw.c
+++ b/drivers/pci/host/pci-keystone-dw.c
@@ -70,7 +70,7 @@
 	*bit_pos = offset >> 3;
 }
 
-u32 ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
+phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);