tools: clippy: Enable --all-features
tools: clippy: Enable --all-features

BUG=none
TEST=./tools/clippy

Change-Id: Ibf673de1a76e529fc350999531d7a198a318be2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3295302
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Commit-Queue: Keiichi Watanabe <815e4e8f7c92a23424d7c3f51ead622bcedbc720@chromium.org>
Reviewed-by: Dennis Kempin <cd09796fb571bec2782819dbfd33307f65b1c778@google.com>

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