mb/lenovo/x1_carbon_gen1: Add 4GiB SPD index 2

Change-Id: I218fd48c8e29563ef089d60ebde7bc36ac8ab189
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/20887
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
3 files changed