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:1ac1e79d18ba13996466fb79fa1c665b9ee9b5b8)
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:f4c086c88b3d66ac9c65eed4b994848cf337d824
Merged-In: I2e5d5b59dd95aa60a07896bf335ebe14c97c411a
Change-Id: I2e5d5b59dd95aa60a07896bf335ebe14c97c411a