Platform/Sgi: ACPI PPTT Table for RD-V1

Processor Properties Topology Table (PPTT) to describe the topological
structure of Processors as a hierarchical tree. PPTT also describes the
Cache private to each node in the hierarchy, and the vendor specific
information regarding the SoC package.

Change-Id: I1cd690e27d6460abe7506711d958e4dd802681a9
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>