Merge "Move netd.c to Tethering module" am: 1f36542d1e am: 20fcb8d714 am: 87e8d5b570

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1952100

Change-Id: I62c58ce6542f6ad13bb17d07e44788bdee17e1f7