Add DRM PRIME surface export options - #39
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Adds typed options for exporting VA surfaces as DRM PRIME, so callers can request access mode and layer layout without reaching for raw libva handles or flags.
Surface::export_prime()keeps the existing read-only composed-layer behavior by delegating to the newexport_prime_with_options()API. The raw descriptor conversion remains private inside the crate so exported file descriptors still only come fromvaExportSurfaceHandle.Verified on Linux with
cargo test -p cros-libva -- --nocapture.