crosvm: Rename trunks `interface.proto`
crosvm: Rename trunks `interface.proto`

`trunks/interface.proto` was renamed to `trunks/trunks_interface.proto`.

Rename `interface.proto` in crosvm accordingly.

BUG=b:193096536
TEST=./build_packages --board=amd64-generic crosvm

Cq-Depend: chromium:3013439
Change-Id: I9c2d1d70e81e60a73daa26fded92746591210ae7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3016218
Reviewed-by: Dennis Kempin <cd09796fb571bec2782819dbfd33307f65b1c778@google.com>
Reviewed-by: Yi Chou <eeb82103f3d7929780df5ca94ee1cbad1ff7b550@google.com>
Reviewed-by: John L Chen <61ad9d14d66a9ed9834f10241bff77a8e1ad34cd@chromium.org>
Reviewed-by: Leo Lai <d3abad941326843b86de0d3fac9f84a9e5ec6881@google.com>
Tested-by: Dennis Kempin <cd09796fb571bec2782819dbfd33307f65b1c778@google.com>
Commit-Queue: Domen Su <d11d22f7dbd5ce2cc259c953391f3b291ef56fb5@google.com>

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