Do not unregister keyguardupdatemonitor

on TextCarrierManager.

Also add a log in keyguardupdatemonitor to indicate that we are
propagating sim state changes.

Test: add invalid card
Test: atest CarrierTextManagerTest
Flag: NONE
Fixes: 321918644
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3fd1793c13e8c357b67593dacb381e57b2943fe5)
Merged-In: I75e7e0234e05f44c9e25ae8d39f5512cba2d1cca
Change-Id: I75e7e0234e05f44c9e25ae8d39f5512cba2d1cca