device-common: Do not strip signed GKI modules am: 43bc0091db am: b4b0b7a60d am: 342c10d090

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2422895

Change-Id: I19d2ff83829263b92a27ca2ec2be61e508e64094
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>