drm/xe: Fix xe_display_fini() calls

xe_display_fini() undoes things from xe_display_init() (technically from
intel_display_driver_probe()). Those `goto err` in xe_device_probe()
were wrong and being accumulated over time.

Commit 65e366ac ("drm/xe/display: Use a single early init call for
display") made it easier to fix now that we don't have xe_display_* init
calls spread on xe_device_probe(). Change xe_display_init() to use
devm_add_action_or_reset() that will finalize display in the right
order.

While at it, also add a newline and comment about calling
xe_driver_flr_fini.

Cc: Maarten Lankhorst <dev@lankhorst.se>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250213192909.996148-2-lucas.demarchi@intel.com


Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>