COMPMID-2451: Use kernel lws_hint() on enqueue

Avoid querying device's default lws on kernel enqueue as this is already
cached in the kernel during configuration.

Change-Id: Ia26ecb712caeb8f042356815e0cfd23522764d27
Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1803
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/kernels/CLLKTrackerKernel.cpp b/src/core/CL/kernels/CLLKTrackerKernel.cpp
index 40ed630..68a210c 100644
--- a/src/core/CL/kernels/CLLKTrackerKernel.cpp
+++ b/src/core/CL/kernels/CLLKTrackerKernel.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 ARM Limited.
+ * Copyright (c) 2017-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -83,7 +83,7 @@
     ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
     ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(ICLKernel::window(), window);
 
-    enqueue(queue, *this, window);
+    enqueue(queue, *this, window, lws_hint());
 }
 
 void CLLKTrackerFinalizeKernel::configure(ICLLKInternalKeypointArray *new_points_internal, ICLKeyPointArray *new_points)
@@ -112,7 +112,7 @@
     ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
     ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(ICLKernel::window(), window);
 
-    enqueue(queue, *this, window);
+    enqueue(queue, *this, window, lws_hint());
 }
 
 CLLKTrackerStage0Kernel::CLLKTrackerStage0Kernel()
@@ -202,7 +202,7 @@
     add_2D_tensor_argument(idx, _old_scharr_gx, window);
     add_2D_tensor_argument(idx, _old_scharr_gy, window);
 
-    enqueue(queue, *this, window);
+    enqueue(queue, *this, window, lws_hint());
 }
 
 CLLKTrackerStage1Kernel::CLLKTrackerStage1Kernel()
@@ -284,5 +284,5 @@
     unsigned int idx = 0;
     add_2D_tensor_argument(idx, _new_input, window);
 
-    enqueue(queue, *this, window);
+    enqueue(queue, *this, window, lws_hint());
 }