Use different response type for unsolicited mesg requiring wakelock.

+ New type is added as ack from RIL java should be sent only for unsolicited mesgs
which hold wakelock in ril.cpp.

Bug: 22127517

Change-Id: Ib7e920d168ab92665283f80476bad3f5ede033e4
diff --git a/libril/ril.cpp b/libril/ril.cpp
index 8215112..658d158 100755
--- a/libril/ril.cpp
+++ b/libril/ril.cpp
@@ -90,6 +90,7 @@
 #define RESPONSE_UNSOLICITED 1
 #define RESPONSE_SOLICITED_ACK 2
 #define RESPONSE_SOLICITED_ACK_EXP 3
+#define RESPONSE_UNSOLICITED_ACK_EXP 4
 
 /* Negative values for private RIL errno's */
 #define RIL_ERRNO_INVALID_RESPONSE -1
@@ -5263,7 +5264,12 @@
     appendPrintBuf("[UNSL]< %s", requestToString(unsolResponse));
 
     Parcel p;
-    p.writeInt32 (RESPONSE_UNSOLICITED);
+    if (s_callbacks.version >= 13
+                && s_unsolResponses[unsolResponseIndex].wakeType == WAKE_PARTIAL) {
+        p.writeInt32 (RESPONSE_UNSOLICITED_ACK_EXP);
+    } else {
+        p.writeInt32 (RESPONSE_UNSOLICITED);
+    }
     p.writeInt32 (unsolResponse);
 
     ret = s_unsolResponses[unsolResponseIndex]