qemu-ppce500: pass 'range_id' around in pci_map_region

In pci_map_region(), pass 'range_id' to fdt_read_range(),
otherwise the same address will be mapped again in other
calls to pci_map_region()

Signed-off-by: Miao Yan <yammiaobest@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alexander Graf <agraf@suse.de>