cxl/json: remove prefix from tracefs.h #include

Distros vary on whether tracefs.h is placed in {prefix}/libtracefs/
or {prefix}/tracefs/. Since the library ships with pkgconfig info
to determine the exact include path the #include statement can drop
the tracefs/ prefix.

This was previously found and fixed elsewhere:
a598663 ("cxl/monitor: fix include paths for tracefs and traceevent")
but was introduced anew with cxl media-error support in ndctl v80.

Reposted here from github pull request:
#268

[ alison: commit msg and log edits ]

Fixes: 9873123 ("cxl/list: collect and parse media_error records")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Marc Herbert <marc.herbert@intel.com>
Link: https://lore.kernel.org/r/20250209180348.1773179-1-alison.schofield@intel.com
Signed-off-by: Alison Schofield <alison.schofield@intel.com>

Author: hramrach

cxl/json.c

@@ -9,7 +9,7 @@
 #include <json-c/json.h>
 #include <json-c/printbuf.h>
 #include <ccan/short_types/short_types.h>
-#include <tracefs/tracefs.h>
+#include <tracefs.h>
 
 #include "filter.h"
 #include "json.h"