crosvm: only compile out trace statements in release builds
crosvm: only compile out trace statements in release builds

At least for now, to keep previous behaviour fully.

BUG=none
TEST=cq

Change-Id: Idb6114d1ea5145cdafa9ab25e4e5f2f9887e8dc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3611465
Reviewed-by: Dennis Kempin <cd09796fb571bec2782819dbfd33307f65b1c778@google.com>
Commit-Queue: Dennis Kempin <cd09796fb571bec2782819dbfd33307f65b1c778@google.com>
Auto-Submit: Anton Romanov <7c8c28e1283c1d87f2c3df4d6b5c74b6ae02bcd9@google.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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