[QNN EP] Enable automatic selection of QNN EP for PREFER_NPU policy (#24629)
### Description
- Enables automatic selection of QNN EP for PREFER_NPU policy
- Fixes cpuid vendor id for Qualcomm to be `'Q' | ('C' << 8) | ('O' <<
16) | ('M' << 24);`
Sample code from unit test:
```c++
// Tests autoEP feature to automatically select an EP that supports the NPU.
// Currently only works on Windows.
TEST_F(QnnHTPBackendTests, AutoEp_PreferNpu) {
ASSERT_ORTSTATUS_OK(Ort::GetApi().RegisterExecutionProviderLibrary(*ort_env, kQnnExecutionProvider,
ORT_TSTR("onnxruntime_providers_qnn.dll")));
Ort::SessionOptions so;
so.SetEpSelectionPolicy(OrtExecutionProviderDevicePolicy_PREFER_NPU);
const ORTCHAR_T* ort_model_path = ORT_MODEL_FOLDER "nhwc_resize_sizes_opset18.quant.onnx";
Ort::Session session(*ort_env, ort_model_path, so);
EXPECT_TRUE(SessionHasEp(session, kQnnExecutionProvider));
ASSERT_ORTSTATUS_OK(Ort::GetApi().UnregisterExecutionProviderLibrary(*ort_env, kQnnExecutionProvider));
}
```
### Motivation and Context
A recent feature allows ORT to automatically select an EP according to
policies set by the user (e.g., prefer npu or prefer gpu). This PR
allows QNN EP to be potentially selected when the user sets the
`PREFER_NPU` policy.
onnxruntime
ade008ed - [QNN EP] Enable automatic selection of QNN EP for PREFER_NPU policy (#24629)
