PCI: spear13xx: Drop unnecessary root_bus_nr setting

Function dw_pcie_host_init() already initializes the root_bus_nr field
of 'struct pcie_port', so the -1 assignment prior to calling
dw_pcie_host_init() in platform specific driver is not really needed.
Drop it.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>

drivers/pci/controller/dwc/pcie-spear13xx.c

@@ -210,7 +210,6 @@ static int spear13xx_add_pcie_port(struct spear13xx_pcie *spear13xx_pcie,
 		return ret;
 	}
 
-	pp->root_bus_nr = -1;
 	pp->ops = &spear13xx_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);