Fix fill() for FP data type in fixtures - Part 1

Resolves: COMPMID-4050

Signed-off-by: Giorgio Arena <giorgio.arena@arm.com>
Change-Id: I182548bf4b944c499a7134ac005b137877e61baf
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4700
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/fixtures/ConvolutionLayerFixture.h b/tests/validation/fixtures/ConvolutionLayerFixture.h
index e1452f5..94fbc53 100644
--- a/tests/validation/fixtures/ConvolutionLayerFixture.h
+++ b/tests/validation/fixtures/ConvolutionLayerFixture.h
@@ -142,9 +142,14 @@
             }
             case DataType::BFLOAT16:
             case DataType::F16:
+            {
+                arm_compute::utils::uniform_real_distribution_fp16 distribution{ half(-1.0f), half(1.0f) };
+                library->fill(tensor, distribution, i);
+                break;
+            }
             case DataType::F32:
             {
-                std::uniform_real_distribution<> distribution(-1.0f, 1.0f);
+                std::uniform_real_distribution<float> distribution(-1.0f, 1.0f);
                 library->fill(tensor, distribution, i);
                 break;
             }