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

jira LE-4018
Rebuild_History Non-Buildable kernel-5.14.0-570.37.1.el9_6
commit-author Ville Syrjälä <ville.syrjala@linux.intel.com>
commit 8305d47

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>
(cherry picked from commit 8305d47)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/gpu/drm/i915/display/intel_display_trace.h

@@ -4,7 +4,11 @@
  */
 
 #undef TRACE_SYSTEM
+#ifdef I915
 #define TRACE_SYSTEM i915
+#else
+#define TRACE_SYSTEM xe
+#endif
 
 #if !defined(__INTEL_DISPLAY_TRACE_H__) || defined(TRACE_HEADER_MULTI_READ)
 #define __INTEL_DISPLAY_TRACE_H__