crosvm: ignore gpu_display in src_test

The gpu_display crate has no tests and only breaks the build process
because wayland client libraries are currently missing.

TEST=crosvm builds
BUG=chromium:837073

Change-Id: I6e0c031bfe9fbd3686d648dbd68959c1b2f5e2cf
Reviewed-on: https://chromium-review.googlesource.com/1096300
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
1 file changed