[build/openvino] fix build option when using use_openvino with hetero/multi/auto

[zoulee24]

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Description

fix openvino hetero/multi/auto config compile

Motivation and Context

When building with the option -- use_openvino and values of HETERO/MULTI/AUTO (ex: AUTO: GPU, CPU...), the build will fail. I used a temporary variable std:: string dev_type_ (DEVICE) to avoid this issue, as I was trying to assign DEVICE to const std:: string, which is const char *.

#22175

[zoulee24]

Windows CI/Vcpkg (pull_dequest) failed due to network error

[jywu-msft]

@sfatimar @preetha-intel fyi

[zoulee24]

What can I do to advance code merging?

@sfatimar @preetha-intel fyi

[sfatimar]

https://github.com/intel/onnxruntime/pull/474/files. Can you please simply remove const from dev_type parameter, it is much simpler fix.

[sfatimar]

https://github.com/microsoft/onnxruntime/pull/22424 Please check if issue is fixed with this PR. It is merged.