Detect Jetson GPUs in Linux DRM device discovery (#32544)
### Description
- Recognize non-PCI DRM devices using the NVIDIA `nvgpu`/`nvidia`
driver.
- Surface them as integrated NVIDIA GPUs without PCI identity metadata.
- Continue excluding AMD XCP and other non-NVIDIA platform devices.
- Add focused Jetson-style sysfs discovery coverage.
### Motivation and Context
Jetson GPUs use the platform/host1x bus and lack PCI vendor attributes,
causing Linux device discovery to skip them. Consequently, the CUDA
plugin EP is absent from `GetEpDevices()` despite loading successfully.
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- Fixes #32541
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: tianleiwu <30328909+tianleiwu@users.noreply.github.com>
Co-authored-by: Tianlei Wu <tlwu@microsoft.com>
