Prevent calling requestTetheredInterface when using adb over ethernet

Otherwise, if adb over ethernet is used, assumeNoInterfaceForTetheringAvailable() tears down the adb
connection because the call to requestTetheredInterface() tears
down IpClient.

Bug: 357332207
Test: atest EthernetManagerTest
Change-Id: I9d04c1a8d39d0accd8061dbfb195ae2359f48e93
1 file changed