cleanup: drop unnecessary i16 type support

Author: ye-NX

ggml/src/ggml-sycl/concat.cpp

@@ -193,9 +193,6 @@ void ggml_sycl_op_concat(ggml_backend_sycl_context & ctx, ggml_tensor *dst) {
     case GGML_TYPE_F32:
         concat_impl_sycl<float>(ctx, dst);
         break;
-    case GGML_TYPE_I16:
-        concat_impl_sycl<int16_t>(ctx, dst);
-        break;
     case GGML_TYPE_I32:
         concat_impl_sycl<int32_t>(ctx, dst);
         break;

tests/test-backend-ops.cpp

@@ -6859,7 +6859,6 @@ static std::vector<std::unique_ptr<test_case>> make_test_cases_eval() {
         for (int dim : { 0, 1, 2, 3, }) {
             test_cases.emplace_back(new test_concat(GGML_TYPE_F32, {11, 12, 13, 14}, 7, dim, v));
             test_cases.emplace_back(new test_concat(GGML_TYPE_I32, {11, 12, 13, 14}, 7, dim, v));
-            test_cases.emplace_back(new test_concat(GGML_TYPE_I16, {11, 12, 13, 14}, 7, dim, v));
         }
     }