vts(wifi): Stop wifi fully instead of stopping framework am: 874239047a am: 356437d474 am: 4df2e04aa9 am: 75baf03af7

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/15847168

Change-Id: I824f873cd407e1d51dcd1983156a1c99bc533220