Attempt to deflake BinderTest.testTetherDeletedInterface.

This test is quite flaky when run on shared devices. Increase
the time that the test will wait for dnsmasq to start up and bind
to interfaces.

Bug: 154558335
Original-Change: https://android-review.googlesource.com/1298447
Merged-In: Ie0735cc3a8b09c5fce4d2e2b5ad6ced4f82d40a8
Change-Id: Ie0735cc3a8b09c5fce4d2e2b5ad6ced4f82d40a8