Hfp: respond additional "OK" to AT+CGMI and AT+CGMM

"+CGMI: " and "+CGMM: " should be followed by "OK".

Change-Id: Ib8d8f4a26e6cafb62f53a145a1ddee30f63b7b30
CRs-Fixed: 2548421
diff --git a/src/com/android/bluetooth/hfp/HeadsetStateMachine.java b/src/com/android/bluetooth/hfp/HeadsetStateMachine.java
index 37c5c22..784dead 100644
--- a/src/com/android/bluetooth/hfp/HeadsetStateMachine.java
+++ b/src/com/android/bluetooth/hfp/HeadsetStateMachine.java
@@ -2640,8 +2640,10 @@
             mNativeInterface.atResponseCode(device, HeadsetHalConstants.AT_RESPONSE_ERROR, 0);
         } else if (atCommand.equals("+CGMI")) {
             mNativeInterface.atResponseString(device, "+CGMI: \"" + Build.MANUFACTURER + "\"");
+            mNativeInterface.atResponseCode(device, HeadsetHalConstants.AT_RESPONSE_OK, 0);
         } else if (atCommand.equals("+CGMM")) {
             mNativeInterface.atResponseString(device, "+CGMM: " + Build.MODEL);
+            mNativeInterface.atResponseCode(device, HeadsetHalConstants.AT_RESPONSE_OK, 0);
         } else {
             processVendorSpecificAt(atCommand, device);
         }