Platform/Sgi: Add a new PCD for defining addressable bits per chip
Add a new PCD to define the maximum number of address bits used for
addresses within a chip. The value of this PCD can be used to derive the
maximum addressable memory region for each chip and to calculate the
address space offset of a remote chip on multi-chip platform.
In preparation of adding a multi-chip variant of the RD-N2 platform,
use this new PCD to allow maximum address space of 64TB per chip for all
RD-N2 platform variants.
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>