Fixed the incorrect carrier config for 5G icon timer

The default value of 5G icon timer reset during voice call
was incorrectly enabled. It should be disabled by default
and only enabled for Verizon.

Fix: 345668599
Fix: 370840390
Test: Basic telephony functionality tests
Flag: EXEMPT bug fix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:99cbaa30bb0a47752baf44510b1a7f7e9ea625ba)
Merged-In: I31c26f1b397253b6d432ab80bac010cd5207c23a
Change-Id: I31c26f1b397253b6d432ab80bac010cd5207c23a