Re-enable LTO for linux-kselftest am: 5d9d3fcd36 am: 70e98809fa am: 95fceb762b

Original change: https://android-review.googlesource.com/c/platform/external/linux-kselftest/+/2853675

Change-Id: I2956d04f153f59d818c0bd51f467ed6ffa92daeb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>