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

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

Change-Id: Ic8a7a6f3206cd23685c709b98ea5ad0a9acd5427
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>