COMPMID-1995: Fix clang-tidy warnings

- Remove VirtualCall checks
- Fix some unused variables errors
- Use std::array insted of C style arrays
- Various fixes

Change-Id: Ife6170b7102de42b8f04e298dcf8476bf90779f0
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1049
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp b/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp
index 048c229..f412980 100644
--- a/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp
+++ b/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2017 ARM Limited.
+ * Copyright (c) 2016-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -80,7 +80,7 @@
     static const int16x8_t two  = vdupq_n_s16(2);
     static const int16x8_t four = vdupq_n_s16(4);
 
-    execute_window_loop(window, [&](const Coordinates & id)
+    execute_window_loop(window, [&](const Coordinates &)
     {
         uint8x16_t top_data = vld1q_u8(input_top_ptr + input.offset());
         uint8x16_t mid_data = vld1q_u8(input_mid_ptr + input.offset());