drm/xe: Drop trace_xe_hw_fence_free

fence->ctx may be stale memory when trace_xe_hw_fence_free is called
resuling UAF bug when deriving the device name. This tracepoint is not
all that useful, so just drop it.

Fixes: 501c4255c409 ("drm/xe/trace: Print device_id in xe_trace events")
Cc: Ville Syrjälä <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Gustavo Sousa <[email protected]>
Cc: Radhakrishna Sripada <[email protected]>
Cc: Matt Roper <[email protected]>
Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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