Ensure device does not use "allow hold" carrier config option.

This device predates the introduction of the "allow_hold_in_ims_call"
carrier config option, and it is undesirable to take away the functionality
associated with that carrier config valeu.  Setting this to "false" here
ensures that future releases for the device retains existing functionality.

Bug: 30449352
Change-Id: Idbb04bd0de64b21a0abaa8e37b6ec6078499c286
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index 23c87e4..72f6530 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -286,6 +286,10 @@
     <!-- Flag specifying whether WFC over IMS is availasble on device -->
     <bool name="config_device_wfc_ims_available">true</bool>
 
+    <!-- Flag specifying that this device will NOT use the "allow_hold_in_ims_call" carrier config
+         option. -->
+    <bool name="config_device_respects_hold_carrier_config">false</bool>
+
     <!-- Configure mobile tcp buffer sizes in the form:
          rat-name:rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max
          If no value is found for the rat-name in use, the system default will be applied.