[automerger skipped] DO NOT MERGE Add sleep(3) after stopSupplicant when VtsHalWifiSupplicant am: ca078935 -s ours am: eda78520 -s ours

am skip reason: subject contains skip directive

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1478060

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Icf2d14fd05ff3251f93de94de5078d9869df223f