[automerger skipped] Fix the mStopTimeNs not be reset in Stopwatch#Restart am:...

[automerger skipped] Fix the mStopTimeNs not be reset in Stopwatch#Restart am: 0c423089 am: 7f626e3b -s ours am: 944ea283 -s ours am: a73c2bd1 -s ours

am skip reason: Change-Id Ib83ceb70af3491dacbb4a45f65ef38661ae75e32 with SHA-1 0c423089 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/11931260

Change-Id: If374b528548e02b395652f27de35c6131fd70f25