drm/xe/display: drop duplicate display->fb_tracking.lock init

The spinlock is initialized in intel_display_driver_early_probe(). Drop
the extra init.

Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://lore.kernel.org/r/f895a8a43c61a6e60db8e1eb698919ce0faab27c.1747397638.git.jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>