Fix 2083478: Camera needs an auto-focus cancel API

Change-Id: I13bda991b32aee47e82b5cf9d43b3021c416a9a2
diff --git a/camera/libcameraservice/CameraHardwareStub.cpp b/camera/libcameraservice/CameraHardwareStub.cpp
index 24496bb..35f4846 100644
--- a/camera/libcameraservice/CameraHardwareStub.cpp
+++ b/camera/libcameraservice/CameraHardwareStub.cpp
@@ -265,6 +265,11 @@
     return NO_ERROR;
 }
 
+status_t CameraHardwareStub::cancelAutoFocus()
+{
+    return NO_ERROR;
+}
+
 /*static*/ int CameraHardwareStub::beginPictureThread(void *cookie)
 {
     CameraHardwareStub *c = (CameraHardwareStub *)cookie;