camera2: Update code for CameraMetadata.Key refactor

Bug: 15091017
Change-Id: Ic56c54c0d184e209e20de374dc8a6d79527c209f
diff --git a/camera2/public/src/com/android/ex/camera2/pos/AutoFocusStateMachine.java b/camera2/public/src/com/android/ex/camera2/pos/AutoFocusStateMachine.java
index 500fb12..9fa2af2 100644
--- a/camera2/public/src/com/android/ex/camera2/pos/AutoFocusStateMachine.java
+++ b/camera2/public/src/com/android/ex/camera2/pos/AutoFocusStateMachine.java
@@ -16,7 +16,7 @@
 package com.android.ex.camera2.pos;
 
 import android.hardware.camera2.CameraDevice;
-import android.hardware.camera2.CameraMetadata.Key;
+import android.hardware.camera2.CaptureResult.Key;
 import android.hardware.camera2.CaptureRequest;
 import android.hardware.camera2.CaptureResult;
 import android.util.Log;