Add an OWNERS_core_networking_xts for CTS/GTS/... and use it. am: 7aac4ad2f7 am: 95edb88396 am: 7244b495d7 am: 65d2727030

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

Change-Id: I35f49a761400614d9d7304c7e553b21623647fec