Fix tethering jarjar rule for LocalLog

LocalLog is in android.util* instead of android.net*.
No crash happened because the methods used by tethering are
@UnsupportedAppUsage.

Bug: 160113128
Test: atest TetheringTests
Change-Id: I5f070b96f96aaabf7ec8da52a3d3444ed940fb56
2 files changed