Add updateState to AutoTimeZonePreferenceController

The summary (i.e. description under the toggle title in Android settings) from AutoTimeZonePreferenceController is only used in wifi-only devices, like Tangor. We have found that since V, the summary was no longer displayed in the Date and time settings page. This fix brings the summary back.

Bug: b/363176828
Test: tested on a Tangor tablet
Flag: EXEMPT bugfix

Change-Id: I1f118b8e1d5e0d8d1b0f5b515d79522b72fb4fa4