aarch64: remove unused UnixDatagram import
aarch64: remove unused UnixDatagram import

BUG=None
TEST=emerge-kevin crosvm

Change-Id: I0d0197002d1d048a19139da9a11f6426c55f7f87
Signed-off-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1295349
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Reviewed-by: Zach Reizner <3374927928a53d04457674c546bd4de57c2044ec@chromium.org>

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