IMS: Use AOSP Defined Carrier Config APIs for RTT

 These APIs are now made @SystemAPI.
 We can now reuse these APIs instead of using CarrierConfig
 string values as parameters in QtiImsExtUtils.

Change-Id: I145e6bc69cad56cc5bbb0e21b63a25a05064824f
CRs-Fixed: 2817533
1 file changed
tree: a648d46b2afe962e7ae25d6f06ca66de8f88da27
  1. ims/
  2. internal/
  3. qti-hidl-wrapper/
  4. qti-utils/