Make NetworkStack API shims available to Tethering. am: 0ef45d4c5d am: 7bd1cb75dc

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1614992

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4be3a973e315a0c3fcbd32b0c07d798a5cea6517