AGESA f12 vendorcode: Keep only Liano refcode

The only subtree we build is /LN.

Change-Id: I035932a4be41fa0451a3f3c7be33442afeeb5571
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/21253
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
108 files changed