Platform/Sgi: Add SMBIOS Type4 Table

Add the SMBIOS type 4 table (Processor Information) that includes
information about manufacture, family, processor id, maximum operating
frequency, and other information related to the processor.

Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>
Reviewed-by: Thomas Abraham <thomas.abraham@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>