Revert "Stop usb tethering when user cancel it"

This reverts commit 9546b7fdcb15d1efed964d60e30bc0a18417bacd.

Reason for revert: This CL will have side effort, when switch from "USB tethering" to "MTP/PTP/Midi" mode, DUT will jump to "No data transfer".
Revert this CL and have good solution to address b/154933817

Bug: 156318036
Test: build pass
Change-Id: Ia79b7a9f5d71c15244b147f5ef26af47c1c1fc7c
2 files changed