Update CPU kernel implementations and guard directives

Resolves COMPMID-6023

Change-Id: I868975d14c4f98af6716726feda22405a6a4c891
Signed-off-by: Michael Tyler <michael.tyler@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9686
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/NEON/kernels/arm_gemm/gemm_int16.cpp b/src/core/NEON/kernels/arm_gemm/gemm_int16.cpp
index 18d8fc9..aa6ecc2 100644
--- a/src/core/NEON/kernels/arm_gemm/gemm_int16.cpp
+++ b/src/core/NEON/kernels/arm_gemm/gemm_int16.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2020, 2022 Arm Limited.
+ * Copyright (c) 2017-2020, 2022-2023 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -57,6 +57,7 @@
 /* Explicitly instantiate the external functions for these types. */
 template UniqueGemmCommon<int16_t, int32_t> gemm<int16_t, int32_t, Nothing>(const GemmArgs &args, const Nothing &);
 template bool has_opt_gemm<int16_t, int32_t, Nothing>(WeightFormat &weight_format, const GemmArgs &args, const Nothing &);
+template KernelDescription get_gemm_method<int16_t, int32_t, Nothing>(const GemmArgs &args, const Nothing &);
 template std::vector<KernelDescription> get_compatible_kernels<int16_t, int32_t, Nothing> (const GemmArgs &args, const Nothing &);
 
 } // namespace arm_gemm