drm/i915: Give i915 and xe each their own display tracepoints

drm/i915: Give i915 and xe each their own display tracepoints

Currently we just define the display tracepoints with
TRACE_SYSTEM i915. However the code gets included separately
in i915 and xe, and now both modules are competing for the
same tracepoints. Apparently whichever module is loaded first
gets the tracepoints and the other guy is left with nothing.

Give each module its own set of display tracepoints so that
things work even when both modules are loaded.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250127213055.640-1-ville.syrjala@linux.intel.com
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>