Platform/Sgi: ACPI PPTT Table for RD-N2

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: Idf70a583b1df9100a3f06112d3cf1b6a5370aa76
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>