pci: mvebu: Use PCI_CONF1_EXT_ADDRESS() macro

PCI mvebu driver uses extended format of Config Address for PCI
Configuration Mechanism #1.

So use new U-Boot macro PCI_CONF1_EXT_ADDRESS() and remove old custom
driver address macros.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>