COMPID-3324: Clean GEMM kernels

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I170de1671e061a78740caee31fb4a1b8642c1369
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3505
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/arm_compute/core/CPP/CPPTypes.h b/arm_compute/core/CPP/CPPTypes.h
index d3f6fc9..59aecd2 100644
--- a/arm_compute/core/CPP/CPPTypes.h
+++ b/arm_compute/core/CPP/CPPTypes.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2019 ARM Limited.
+ * Copyright (c) 2017-2020 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -44,7 +44,8 @@
     GENERIC_FP16_DOT,
     A53,
     A55r0,
-    A55r1
+    A55r1,
+    X1
 };
 
 /** Global memory policy.
@@ -94,6 +95,10 @@
         {
             return std::string("A55r1");
         }
+        case CPUModel::X1:
+        {
+            return std::string("X1");
+        }
         default:
         {
             ARM_COMPUTE_ERROR("Invalid CPUModel.");