ggml-cpu: drop support for nnpa intrinsics (#15821)

ggml/src/ggml-cpu/ggml-cpu.cpp

@@ -576,9 +576,6 @@ static ggml_backend_feature * ggml_backend_cpu_get_features(ggml_backend_reg_t r
         if (ggml_cpu_has_vxe()) {
             features.push_back({ "VXE", "1" });
         }
-        if (ggml_cpu_has_nnpa()) {
-            features.push_back({ "NNPA", "1" });
-        }
         if (ggml_cpu_has_wasm_simd()) {
             features.push_back({ "WASM_SIMD", "1" });
         }