Add RIL_UNSOL_RESEND_INCALL_MUTE.

For bug 2400052.

Notification requires user resend mute/unmute to get uplink audio in a call.
diff --git a/libril/ril.cpp b/libril/ril.cpp
index 6f36b8d..8ec9bba 100644
--- a/libril/ril.cpp
+++ b/libril/ril.cpp
@@ -3025,6 +3025,7 @@
         case RIL_UNSOL_CDMA_INFO_REC: return "UNSOL_CDMA_INFO_REC";
         case RIL_UNSOL_OEM_HOOK_RAW: return "UNSOL_OEM_HOOK_RAW";
         case RIL_UNSOL_RINGBACK_TONE: return "UNSOL_RINGBACK_TONE";
+        case RIL_UNSOL_RESEND_INCALL_MUTE: return "UNSOL_RESEND_INCALL_MUTE";
         default: return "<unknown request>";
     }
 }
diff --git a/libril/ril_unsol_commands.h b/libril/ril_unsol_commands.h
index 2dc31e6..3660702 100644
--- a/libril/ril_unsol_commands.h
+++ b/libril/ril_unsol_commands.h
@@ -43,4 +43,5 @@
     {RIL_UNSOL_CDMA_OTA_PROVISION_STATUS, responseInts, WAKE_PARTIAL},
     {RIL_UNSOL_CDMA_INFO_REC, responseCdmaInformationRecords, WAKE_PARTIAL},
     {RIL_UNSOL_OEM_HOOK_RAW, responseRaw, WAKE_PARTIAL},
-    {RIL_UNSOL_RINGBACK_TONE, responseInts, WAKE_PARTIAL}
+    {RIL_UNSOL_RINGBACK_TONE, responseInts, WAKE_PARTIAL},
+    {RIL_UNSOL_RESEND_INCALL_MUTE, responseVoid, WAKE_PARTIAL}