COMPMID-617: Add validate support for NEON ArithmeticLayer

Change-Id: I8b58359487194f4cbf7452df4aea92523b5745bf
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/111351
Tested-by: BSG Visual Compute Jenkins server to access repositories on http://mpd-gerrit.cambridge.arm.com <bsgcomp@arm.com>
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/runtime/NEON/functions/NEArithmeticSubtraction.cpp b/src/runtime/NEON/functions/NEArithmeticSubtraction.cpp
index 37586af..be264d5 100644
--- a/src/runtime/NEON/functions/NEArithmeticSubtraction.cpp
+++ b/src/runtime/NEON/functions/NEArithmeticSubtraction.cpp
@@ -36,3 +36,7 @@
     k->configure(input1, input2, output, policy);
     _kernel = std::move(k);
 }
+Error NEArithmeticSubtraction::validate(const ITensorInfo *input1, const ITensorInfo *input2, const ITensorInfo *output, ConvertPolicy policy)
+{
+    return NEArithmeticSubtractionKernel::validate(input1, input2, output, policy);
+}