Add tetheroffload HAL APEX am: d254e37e32 am: 3c7f6052ef am: 45041478bc

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

Change-Id: I2526d90e5fb06abea2005d4ddc69ed65f2c20a73
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>