Remove the custom missed call notification component config.

Change-Id: I9ec899fd8abe6a0dfe8123c60b43d2cfa7cb682c
diff --git a/res/values/config.xml b/res/values/config.xml
index 4e86503..7dd43f4 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -39,10 +39,6 @@
     <!-- Flag indicating if the tty is enabled -->
     <bool name="tty_enabled">true</bool>
 
-    <!-- Component name for the notification handler. The presence of this value will disable
-         MissedCallNotifierImpl's presentation of missed call/voice notifications [DO NOT TRANSLATE] -->
-    <string name="notification_component" translatable="false"></string>
-
     <!-- Flag indicating whether audio should be routed to speaker when docked -->
     <bool name="use_speaker_when_docked">true</bool>