Remove deprecated interface from arm_compute.

The function `get_gemm_method` in arm_compute is deprecated in favor
of the method `arm_gemm::GemmCommon<TypeInput, TypeOutput>::get_config()`.

Signed-off-by: francesco.petrogalli@arm.com

Change-Id: Idd5d879180c3995d5a07a727aa9216b8f94f01ba
Signed-off-by: Francesco.Petrogalli@arm.com <francesco.petrogalli@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7304
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Sheri Zhang <sheri.zhang@arm.com>
diff --git a/src/core/NEON/kernels/arm_gemm/gemm_int8.cpp b/src/core/NEON/kernels/arm_gemm/gemm_int8.cpp
index 8fe1993..a113455 100644
--- a/src/core/NEON/kernels/arm_gemm/gemm_int8.cpp
+++ b/src/core/NEON/kernels/arm_gemm/gemm_int8.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2020 Arm Limited.
+ * Copyright (c) 2017-2020, 2022 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -159,7 +159,6 @@
 
 /* Explicitly instantiate the external functions for these types. */
 template UniqueGemmCommon<int8_t, int32_t> gemm<int8_t, int32_t, Nothing>(const GemmArgs &args, const Nothing &);
-template KernelDescription get_gemm_method<int8_t, int32_t, Nothing>(const GemmArgs &args, const Nothing &);
 template std::vector<KernelDescription> get_compatible_kernels<int8_t, int32_t, Nothing> (const GemmArgs &args, const Nothing &);
 
 } // namespace arm_gemm