FS-9825 fix config file for amr and add the amrwb config

conf/vanilla/autoload_configs/amrwb.conf.xml

+<configuration name="amrwb.conf">
+  <settings>
+    <param name="default-bitrate" value="8"/>
+    <param name="volte" value="1"/>
+    <param name="adjust-bitrate" value="0"/>
+  </settings>
+</configuration>