Set the `UserBd` FSP-M UPD to `BOARD_TYPE_DESKTOP` by default on PCH-H.
Remove now-redundant mainboard code to set the `UserBd` UPD.
Change-Id: I349abe5d89f562c158ce9baadbca2b2f56695846
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57261
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>