Remove mitchp from OWNERS am: cea50c9a35

Original change: https://android-review.googlesource.com/c/device/google/gs-common/+/3321033

Change-Id: I270f087f593d214429eea2004efc2e49eba05277
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>