COMPMID-2486: Remove/add disabled compiler warnings

Removed the following flags:
-Wno-vla
-Wno-strict-overflow

Added:
-Wformat-security

Change-Id: I49eb3d724e14db796e543164295674617c37cb65
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2109
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/utils/Utils.h b/utils/Utils.h
index bc2fef4..1d59ee5 100644
--- a/utils/Utils.h
+++ b/utils/Utils.h
@@ -32,6 +32,7 @@
 #include "arm_compute/runtime/Tensor.h"
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wstrict-overflow"
 #include "libnpy/npy.hpp"
 #pragma GCC diagnostic pop
 #include "support/ToolchainSupport.h"