Add janitors to the OWNERS file am: ea73c4f20a

Original change: https://android-review.googlesource.com/c/platform/external/mime-support/+/3423637

Change-Id: Ie84befae145b74f997a186373123cd72915bdcc9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>