pci: pci_mvebu: use dev_seq instead of static variable

PCI uclass maps PCI bus numbers to the seq member of struct udevice.
Use dev_seq(dev) as the bus number in mvebu_pcie_probe instead of an
incrementing a static variable.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Cc: Stefan Roese <sr@denx.de>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Mario Six <mario.six@gdsys.cc>
Cc: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c
index 235d9bb..bea8dcf 100644
--- a/drivers/pci/pci_mvebu.c
+++ b/drivers/pci/pci_mvebu.c
@@ -273,7 +273,7 @@
 	struct mvebu_pcie *pcie = dev_get_plat(dev);
 	struct udevice *ctlr = pci_get_controller(dev);
 	struct pci_controller *hose = dev_get_uclass_priv(ctlr);
-	static int bus;
+	int bus = dev_seq(dev);
 	u32 reg;
 
 	debug("%s: PCIe %d.%d - up, base %08x\n", __func__,
@@ -336,8 +336,6 @@
 	writel(SOC_REGS_PHY_BASE, pcie->base + PCIE_BAR_LO_OFF(0));
 	writel(0, pcie->base + PCIE_BAR_HI_OFF(0));
 
-	bus++;
-
 	return 0;
 }