Re-enable LTO for linux-kselftest am: 5d9d3fcd36 am: 2091471b13 am: 3c48c09850

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

Change-Id: Ie4f42ad8f11a12ebaca7a8c090cf76a4b2d1cf68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>