CRAS: remove import of unused log macro

This module only invokes `error!`, not `log!`. The log import used to be
required because error expanded to an invocation of log without using
the correct $crate prefix, which is fixed in CL:1565544.

TEST=cargo check
CQ-DEPEND=CL:1565544

Change-Id: I2dfd68df1580d7f1e0b9127b4f26be3911c617b5
Reviewed-on: https://chromium-review.googlesource.com/1566080
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Tested-by: David Tolnay <dtolnay@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
1 file changed