vexpress64: Juno: Change PCI buss addresses for IO to start from zero.

Juno uses a 1:1 mapping between CPU and PCI addresses for IO. First,
that will trip devices that cannot use more than 16 bits of addresses
for IO, second it is un-necessary as the system can handle zero-based
PCI addresses just fine.

Change the mapping to start IO bus addresses from zero.
Signed-off-by: NLiviu Dudau <Liviu.Dudau@foss.arm.com>

board/armltd/vexpress64/pcie.c

@@ -123,7 +123,7 @@ void xr3pci_setup_atr(void)
 	base += XR3PCI_ATR_TABLE_SIZE;
 
 	/* setup IO space translation */
-	xr3pci_set_atr_entry(base, XR3_PCI_IOSPACE_START, XR3_PCI_IOSPACE_START,
+	xr3pci_set_atr_entry(base, XR3_PCI_IOSPACE_START, 0,
 			     XR3_PCI_IOSPACE_SIZE, XR3PCI_ATR_TRSLID_PCIE_IO);
 
 	base += XR3PCI_ATR_TABLE_SIZE;