Platform/Sgi: Add SMBIOS Type17 Table

Add the SMBIOS type 17 table (Memory Device) that includes the
specification of each installed memory device such as size of each
device, bank locator, memory device type, and other related information.

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>