Add janitors to the OWNERS file am: ff0bc47cc9

Original change: https://android-review.googlesource.com/c/platform/external/linux-kselftest/+/3423753

Change-Id: I4567d4ab0b885df26653cc05ce6e10cac44d6303
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>