Show more accurate message when call fails due to thermal mitigation.

Bug: 188928361
Test: emulate radio_off thermal mitigation with
https://docs.google.com/document/d/1mRsIPGdb-zajRhCJm5N1jEKtwZ0yMcQzVST4p0Afj7c/edit?resourcekey=0-AtIFNnN8wNLBkrBYkkWbgg#
and then try to place non-emergency call.

resulting UI: https://screenshot.googleplex.com/zEm87s8eVYdN8QS

Change-Id: Idcee4ef36f6af3abe9d7efe996cf329d350b29ca
Merged-In: Idcee4ef36f6af3abe9d7efe996cf329d350b29ca
2 files changed