Platform/Sgi: Add SMBIOS Type16 Table

Add the SMBIOS type 16 table (Physical Memory Array) describes a
collection of memory devices that operate together to form a memory
address. It includes information about number of devices, total memory
installed, error correction mechanism used and other related information.

Change-Id: I427202ffd145cb2f04a72770d9e5199012cfa28b
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>