onnxruntime

6e418b65 - [VitisAI] pass base timestamp for vitisai profiling (#27808)

[VitisAI] pass base timestamp for vitisai profiling (#27808) ### Description Pass base timestamp for vitisai profiling Notify EP that profiling has started with the base timestamp (in nanoseconds since epoch) The VitisAI EP can use this to: 1. Calculate relative timestamps (event_ts - base_ts) for the profiling timeline 2. Store the absolute base timestamp if needed for other purposes ### Motivation and Context Due to onnxruntime default profiling json file just have the offset timestamp, it doesn't provider the base timestamp for VitisAI EP, To combine the VaitisAI timeline profiling info and the onnxruntime default profiling json file info, We need pass the timestamp for VitisAI EP. --------- Signed-off-by: Andrew Luo <junpengl@amd.com> Co-authored-by: Andrew Luo <junpengl@amd.com>