Prevent extra reloads in mobile networking page/controllers

On the mobile network details page, as well as in several preference
controllers used in various page, we had listeners for the
ACTION_RADIO_TECHNOLOGY_CHANGED broadcast that when fired would cause a
reload. It turns out that this gets broadcast as a sticky intent, so our
callbaks would fire just after registering to listen, resulting in lots
of unnecessary extra reloading. This was particularly noticable on the
mobile network details page because the entire page gets reloaded.

The fix is to make our listeners ignore the broadcast if it's the
initial sticky one.

Bug: 126419558
Test: make RunSettingsRoboTests
Change-Id: I6ab7b43d74b07a839e45ce5368e45809be658b9d