rpi4: Update memory map to accommodate scb devices

rpi4: Update memory map to accommodate scb devices

Some of the devices(for instance, pcie and gnet controller) sitting on
SCB bus falls behind/below the memory range that we currenty have.

This patch updates the memory range to map those devices correctly.

Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>