wifi(vts): Remove a tight loop of toggling wifi state

The tight loop of HAL start/stop exposes a race condition within the HAL.
Adding a fix for preventing this race would need a fix which would be
pretty risky at this point of the release. The issue itself is unlikely
to happen in real use cases because wifi toggles (user initiated or test
scripts initiated) via framework goes through a series of processing
before it invokes the HAL start/stop.

Bug: 64195190
Test: `make vts -j30 BUILD_GOOGLE_VTS=true TARGET_PRODUCT=aosp_arm64 &&
vts-tradefed run commandAndExit vts --skip-all-system-status-check
--primary-abi-only --skip-preconditions --module VtsHalWifiV1_0Target -l
INFO`

Change-Id: I4e4d65f8b6e2e423a3a5f26e5a97a78b7e99c3e8