GPU: remove Road.cxx from standalone build

[mconcas]

@davidrohr : fixing #14370 and possibly needed by #14375

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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[alibuild]

Error while checking build/O2/fullCI_slc9 for 06cac48 at 2025-06-07 03:39:

## sw/BUILD/ONNXRuntime-latest/log
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
ninja: build stopped: subcommand failed.

Full log here.