COMPMID-2671 use Signed32 for default output data type of ArgMinMax

Signed32 is used as data types before and after reshaping of ArgMinMax.

Change-Id: I230af43a931d4e106de6c72f716ced1dab511084
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2262
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
diff --git a/tests/validation/NEON/ArgMinMax.cpp b/tests/validation/NEON/ArgMinMax.cpp
index 642a69b..174cb19 100644
--- a/tests/validation/NEON/ArgMinMax.cpp
+++ b/tests/validation/NEON/ArgMinMax.cpp
@@ -56,7 +56,7 @@
         }),
         framework::dataset::make("OutputInfo", { TensorInfo(TensorShape(27U, 3U, 1U, 2U), 1, DataType::F32),
                                                  TensorInfo(TensorShape(27U, 3U, 1U, 2U), 1, DataType::F32),
-                                                 TensorInfo(TensorShape(32U, 16U, 2U), 1, DataType::U32),
+                                                 TensorInfo(TensorShape(32U, 16U, 2U), 1, DataType::S32),
                                                  TensorInfo(TensorShape(32U, 16U, 1U, 2U), 1, DataType::F32)
         })),
         framework::dataset::make("Axis", { 4, 0, 2, 0 })),