COMPMID-1534 - Fix GEMM and Magnitude test for FP16

On GEMM we had accuracy issue
On Magnitude we have disabled the fp16 acceleration since we do not have feature parity with CL
and this function is not used for ML

Change-Id: Iaebe3bbbd2a9f45db0c714aa5ebaf48eb0b65741
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/145467
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/tests/validation/fixtures/MagnitudeFixture.h b/tests/validation/fixtures/MagnitudeFixture.h
index 1c52907..0930fb4 100644
--- a/tests/validation/fixtures/MagnitudeFixture.h
+++ b/tests/validation/fixtures/MagnitudeFixture.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -43,9 +43,9 @@
 {
 public:
     template <typename...>
-    void setup(TensorShape shape, Format format, MagnitudeType magnitude_type, bool use_fp16)
+    void setup(TensorShape shape, Format format, MagnitudeType magnitude_type)
     {
-        _target         = compute_target(shape, format, magnitude_type, use_fp16);
+        _target         = compute_target(shape, format, magnitude_type);
         _reference      = compute_reference(shape, format, magnitude_type);
         _magnitude_type = magnitude_type;
     }
@@ -57,7 +57,7 @@
         library->fill_tensor_uniform(tensor, seed_offset);
     }
 
-    TensorType compute_target(const TensorShape &shape, Format format, MagnitudeType magnitude_type, bool use_fp16)
+    TensorType compute_target(const TensorShape &shape, Format format, MagnitudeType magnitude_type)
     {
         DataType data_type = data_type_from_format(format);
 
@@ -73,7 +73,7 @@
 
         // Create and configure function
         FunctionType magnitude;
-        magnitude.configure(&src1, &src2, &dst, magnitude_type, use_fp16);
+        magnitude.configure(&src1, &src2, &dst, magnitude_type);
 
         ARM_COMPUTE_EXPECT(src1.info()->is_resizable(), framework::LogLevel::ERRORS);
         ARM_COMPUTE_EXPECT(src2.info()->is_resizable(), framework::LogLevel::ERRORS);