mpc83xx: PCI: Fix hard-coded first_busno value

We should use pci_last_busno() in pci_init_bus(), otherwise we'll
erroneously re-use PCI0's first_busno for PCI1 hoses.

NOTE: The patch is untested. All MPC83xx FSL boards I have have
PCI1 in miniPCI form, for which I don't have any cards handy.

But looking in cpu/mpc85xx/pci.c:
...
#ifdef CONFIG_MPC85XX_PCI2
        hose = &pci_hose[1];

        hose->first_busno = pci_hose[0].last_busno + 1;

And considering that we do the same for MPC83xx PCI-E support,
I think this patch is correct.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

cpu/mpc83xx/pci.c

@@ -91,7 +91,7 @@ static void pci_init_bus(int bus, struct pci_region *reg)
 	hose->regions[i].size = gd->ram_size;
 	hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_SYS_MEMORY;
 
-	hose->first_busno = 0;
+	hose->first_busno = pci_last_busno() + 1;
 	hose->last_busno = 0xff;
 
 	pci_setup_indirect(hose, CONFIG_SYS_IMMR + 0x8300 + bus * 0x80,