plat/sgi: define memory regions for multi-chip platforms

For multi-chip platforms, add a macro to define the memory regions on
chip numbers >1 and its associated access permissions. These memory
regions are marked with non-secure access.

Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>
Change-Id: If3d6180fd8ea61f45147c39d3140d694abf06617
1 file changed