PCI: designware: Swap order of dw_pcie_writel_rc() reg/val arguments

Swap order of dw_pcie_writel_rc() arguments to match the "dev, pos, val"
order used by pci_write_config_word() and other drivers.  No functional
change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 60cbc68..c413848 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -55,7 +55,7 @@
 
 struct pcie_host_ops {
 	u32 (*readl_rc)(struct pcie_port *pp, u32 reg);
-	void (*writel_rc)(struct pcie_port *pp, u32 val, u32 reg);
+	void (*writel_rc)(struct pcie_port *pp, u32 reg, u32 val);
 	int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val);
 	int (*wr_own_conf)(struct pcie_port *pp, int where, int size, u32 val);
 	int (*rd_other_conf)(struct pcie_port *pp, struct pci_bus *bus,