Disable Wifi when emergency call is made

This satisfies Verizon's requirement.

Bug: 24147407
Change-Id: I3675bbeac858daeaf4a4d7c8e5c9af06da064062
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index 04ae021..99a8a87 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -217,6 +217,9 @@
          radio is unable to find any MCC information to infer wifi country code from -->
     <bool translatable="false" name="config_wifi_revert_country_code_on_cellular_loss">true</bool>
 
+    <!-- Boolean indicating whether or not wifi should turn off when emergency call is made -->
+    <bool translatable="false" name="config_wifi_turn_off_during_emergency_call">true</bool>
+
     <!-- Configure wifi tcp buffersizes in the form:
          rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max -->
     <string name="config_wifi_tcp_buffers" translatable="false">524288,6291456,8291456,524288,6291456,8291456</string>