AGESA f15 vendorcode: Remove AM3r2 refcode

We never had a board in the tree that implements this.

If you are interested in implementing such board, note
that also f12 and f14 had copies of the same refcode.
As part of the sourcetree cleanup it was not studied
which was the most up-to-date one for AM3r2.

Change-Id: Ic7dd065c0df08c22af6f3a2dcfc7ff47d6283a46
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/21255
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
88 files changed