Add tetheroffload HAL APEX am: d254e37e32 am: 3c7f6052ef am: 45041478bc am: 7ae3afc529 am: fbecb61f5f

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2749882

Change-Id: Ic8e1365a5fb1886a5ee108daee2feb193df6de74
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>