chromeos-base/crosvm: add dependency on cfg_if

crosvm will start using this crate with crrev.com/c/3422776.

BUG=b:214478588
TEST=emerge-hatch crosvm

Change-Id: I1a997ef3e09df8b622ad4274c19eb8285c02c06b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3486582
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Tested-by: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
1 file changed