Add an OWNERS_core_networking_xts for CTS/GTS/... and use it. am: 7aac4ad2f7 am: 95edb88396 am: 7244b495d7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1952105

Change-Id: I02f795de93bc0caf6a3f3e7e360d48bd7428499c