Platform/Sgi: Extend SMBIOS support for RD-N2-Cfg1

Extend the SMBIOS support for RD-N2-Cfg1 platform. RD-N2-Cfg1 platform
is a derivative of the RD-N2 platform and so most of the table values
for RD-N2 platform is reused.

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>