mb/*: Specify type of `VARIANT_DIR` once

Specify the type of the `VARIANT_DIR` Kconfig symbol once instead of
doing so on each and every mainboard.

Change-Id: Iea2f992a59e41e00fec3cdc9d6a13b5f3ab0a437
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56558
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions