Fix ReductionLayer FP16 for armv8a multi_isa builds

- Enable FP16 code when building multi_isa for armv8a architecture in
  order to run on higher architectures e.g. 8.2, 8.6.
- When running this build on v8 the validation will stop it flagging
  that the arch does not support FP16.

Resolves: COMPMID-7013
Signed-off-by: Ramy Elgammal <ramy.elgammal@arm.com>
Change-Id: I0d445e2fade31c1156d7a6e142edf2a7f84d3622
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/11544
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Marquez Tello <pablo.tello@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/filelist.json b/filelist.json
index eed9ccd..77656bc 100644
--- a/filelist.json
+++ b/filelist.json
@@ -2115,7 +2115,14 @@
           "common": [
             "src/core/NEON/kernels/NEReductionOperationKernel.cpp",
             "src/runtime/NEON/functions/NEReductionOperation.cpp"
-          ]
+          ],
+          "neon":{
+            "fp32":["src/cpu/kernels/reduction_layer/generic/neon/fp32.cpp"],
+            "fp16":["src/cpu/kernels/reduction_layer/generic/neon/fp16.cpp"],
+            "integer":["src/cpu/kernels/reduction_layer/generic/neon/integer.cpp"],
+            "qasymm8":["src/cpu/kernels/reduction_layer/generic/neon/qasymm8.cpp"],
+            "qasymm8_signed":["src/cpu/kernels/reduction_layer/generic/neon/qasymm8_signed.cpp"]
+          }
         }
       },
       "Reorg": {