add smuckle@ to OWNERS am: 6939b14370 am: ecfbf0fda8 am: e25b7380a4 am: 916ebe6828

Original change: https://android-review.googlesource.com/c/platform/external/linux-kselftest/+/1778592

Change-Id: I7eb92b60c57371b175e459b2e2490d992e0cecf6