src/mb/google/*/Kconfig: Consistently use $(...) for variables

Using ${...} in some places is slightly confusing.

Fixes: 395cbb4f97 ("mb/*/*/Kconfig: Use CONFIG_VARIANT_DIR for devicetree")
Change-Id: Id0856a10d92786a41d45ca697945699f6f4c1f4c
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/c/30163
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

0 files changed, 0 insertions, 0 deletions