Fix build for gcc 9

Resolves COMPMID-5127

Signed-off-by: Giorgio Arena <giorgio.arena@arm.com>
Change-Id: I2b1eefdf5d9a58a13295b27f2d66e461d9b9289c
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7086
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
diff --git a/src/cpu/kernels/CpuKernelSelectionTypes.h b/src/cpu/kernels/CpuKernelSelectionTypes.h
index 779fb86..60dcea4 100644
--- a/src/cpu/kernels/CpuKernelSelectionTypes.h
+++ b/src/cpu/kernels/CpuKernelSelectionTypes.h
@@ -36,17 +36,17 @@
 // Selector data types
 struct DataTypeISASelectorData
 {
-    DataType                   dt;
-    const cpuinfo::CpuIsaInfo &isa;
+    DataType            dt;
+    cpuinfo::CpuIsaInfo isa;
 };
 
 struct PoolDataTypeISASelectorData
 {
-    DataType                   dt;
-    DataLayout                 dl;
-    int                        pool_stride_x;
-    Size2D                     pool_size;
-    const cpuinfo::CpuIsaInfo &isa;
+    DataType            dt;
+    DataLayout          dl;
+    int                 pool_stride_x;
+    Size2D              pool_size;
+    cpuinfo::CpuIsaInfo isa;
 };
 
 // Selector pointer types