trace_dma_fence_init() uses dma_fence_ops functions
like get_driver_name() and get_timeline_name() to generate trace
information but the Xe KMD implementation of those functions makes
use of xe_hw_fence_ctx that was being set after dma_fence_init().

So here just inverting the order to fix the crash.

Fixes: dd08ebf6 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240124171830.95774-1-jose.souza@intel.com