Fix NPE at DisplayInfoController

Avoid pre-mature call of updateTelephonyDisplayInfo() until NetworkTypeController() is being constructed.

Callback when registered if called immediately before the object being constructed, can lead to NPE.

Flag: EXEMPT Bugfix
Bug: 375921149
Bug: 383766616
Test: m and atest
Test: Regression at b/383766616
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3c9b3d9b565fbb232130a092c738d4f78bcf1928)
Merged-In: I9787d304b8fa232dbd68bd986a13a1cd56e1f87f
Change-Id: I9787d304b8fa232dbd68bd986a13a1cd56e1f87f
2 files changed