COMPMID-3638: Move NEON kernels

Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Change-Id: Ieed3e4bc8be7fef80c90c5094599b477a56fc473
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4285
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/Types.h b/arm_compute/core/Types.h
index 42e42cc..306bdc6 100644
--- a/arm_compute/core/Types.h
+++ b/arm_compute/core/Types.h
@@ -2246,5 +2246,14 @@
     /** Align columns */
     bool align_columns;
 };
+
+/** Internal keypoint class for Lucas-Kanade Optical Flow */
+struct NELKInternalKeypoint
+{
+    float x{ 0.f };                 /**< x coordinate of the keypoint */
+    float y{ 0.f };                 /**< y coordinate of the keypoint */
+    bool  tracking_status{ false }; /**< the tracking status of the keypoint */
+};
+
 } // namespace arm_compute
 #endif /* ARM_COMPUTE_TYPES_H */