Fix undefined ClMatMulNativeKernel::validate for high priority build

Resolves COMPMID-6249

Signed-off-by: SiCong Li <sicong.li@arm.com>
Change-Id: I910ecec57279ecc20aeac2d24b0caa27f688f693
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9612
Reviewed-by: Jakub Sujak <jakub.sujak@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/filelist.json b/filelist.json
index 4cf6230..807000a 100644
--- a/filelist.json
+++ b/filelist.json
@@ -106,7 +106,8 @@
     "Conv2d",
     "Permute",
     "Pool2d",
-    "Reshape"
+    "Reshape",
+    "MatMul"
   ],
   "gpu": {
     "common": [