devices: ac97: fix missing import with audio_cras
devices: ac97: fix missing import with audio_cras

The `error!` macro is still used when the audio_cras feature is enabled.
Add its import back.

BUG=None
TEST=emerge-trogdor crosvm

Change-Id: I06430fece32fc203bf0e9005f29e346dad88eea4
Fixes: 28c318fa20fa ("Fix ChromeOS build")
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3798972
Tested-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Auto-Submit: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-by: Junichi Uekawa <6bd240a6ce32463e272bb69c685a8e946b33ac05@chromium.org>
Commit-Queue: Junichi Uekawa <6bd240a6ce32463e272bb69c685a8e946b33ac05@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm