FM: Change property name for FM A2DP concurency

Change property name for FM A2DP concurency as introduced
as a part of Android O recommendation.

Change-Id: I0a5224b0b1c4d4cd2886b7b51a2d605679c09be1
CRs-fixed: 2073400
diff --git a/fmapp2/src/com/caf/fmradio/FMRadioService.java b/fmapp2/src/com/caf/fmradio/FMRadioService.java
index a40700d..8d6ace1 100644
--- a/fmapp2/src/com/caf/fmradio/FMRadioService.java
+++ b/fmapp2/src/com/caf/fmradio/FMRadioService.java
@@ -235,7 +235,7 @@
    public void onCreate() {
       super.onCreate();
 
-      mFmA2dpDisabled = SystemProperties.getBoolean("fm.a2dp.conc.disabled",false);
+      mFmA2dpDisabled = SystemProperties.getBoolean("vendor.fm.a2dp.conc.disabled",false);
       mPrefs = new FmSharedPreferences(this);
       mCallbacks = null;
       TelephonyManager tmgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);