Changed technology close() to reconnect to the tag instead of physical disconnect.

Change-Id: I8935e4aae452adeec472c0b3ff3c77f1400a264e

core/java/android/nfc/INfcTag.aidl

@@ -25,6 +25,7 @@ interface INfcTag
 {
     int close(int nativeHandle);
     int connect(int nativeHandle);
+    int reconnect(int nativeHandle);
     int[] getTechList(int nativeHandle);
     byte[] getUid(int nativeHandle);
     boolean isNdef(int nativeHandle);

core/java/android/nfc/technology/BasicTagTechnology.java

@@ -162,7 +162,10 @@ import android.util.Log;
     public void close() {
         mIsConnected = false;
         try {
-            mTagService.close(mTag.getServiceHandle());
+            /* Note that we don't want to physically disconnect the tag,
+             * but just reconnect to it to reset its state
+             */
+            mTagService.reconnect(mTag.getServiceHandle());
         } catch (RemoteException e) {
             attemptDeadServiceRecovery(e);
         }