Protect shell overriding the carrier config

Bug: 441823943
Flag: EXEMPT Bugfix
Test: Manually verified the scenario and all telephony and telecom CTS are verified
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:883ddab0c639c40d122d857ed6010d4c63f8ab11)
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:b0b2e7aa2dadf25a9244b8f43b5c134c1fecf713
Merged-In: I7662a98ad19fe37fd77ca3a3325d09a666be0ff9
Change-Id: I7662a98ad19fe37fd77ca3a3325d09a666be0ff9