Add janitors to the OWNERS file am: ca46dcc1c3

Original change: https://android-review.googlesource.com/c/platform/external/libexif/+/3423518

Change-Id: Id10da39e42eeef094fea6d45fcac4b9bc1fd4d70
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>