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
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 47d571e..2077530 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1195,6 +1195,8 @@
     <string name="incall_error_power_off" product="default">Turn off airplane mode to make a call.</string>
     <!-- In-call screen: call failure message displayed in an error dialog when in airplane mode, WFC is enabled, not wifi-only, and not connected to wireless networks. [CHAR_LIMIT=NONE] -->
     <string name="incall_error_power_off_wfc">Turn off airplane mode or connect to a wireless network to make a call.</string>
+    <!-- In-call screen: call failure message displayed in an error dialog when radio off due to thermal mitigation. [CHAR_LIMIT=NONE] -->
+    <string name="incall_error_power_off_thermal" product="default"><b>Phone too hot</b>\n\nCan\'t complete this call. Try again when your phone cools down.\n\nYou can still make emergency calls.</string>
     <!-- In-call screen: call failure message displayed when the user attempts to make a non-emergency call while the phone is in emergency callback mode. -->
     <string name="incall_error_ecm_emergency_only">Exit emergency callback mode to make a non-emergency call.</string>
     <!-- In-call screen: call failure message displayed in an error dialog.