gn2bp: Fix use of soong_zip with OUT_DIR=/abs/path am: dfb67ba455 am: 9be311bed1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2401046

Change-Id: If0ca9dbde876f76f3e0664129e39dc3f58ca5e90
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>