[DmlEp] Make DmlEp compatible with Clang for EPIC (#9585)
* Make DmlEp Clang compatible for EPIC
* Fix build issues occurred when engine/lotus points to ORT Github latest
* Fix more build errors
* Fixed one build issue and removed temporary changes for Clang
* Addressed comments on the PR.
* Style fixes
* Fix unreachable code
Co-authored-by: Sumit Agarwal <sumitagarwal@microsoft.com>
Co-authored-by: Dwayne Robinson <dwayner@microsoft.com>
