display: add pixel display trace to bugreport

AVC error log justifications:
[ 1198.907014] type=1400 audit(1728067746.876:2074): avc:  denied  { search } for  comm="cat" name="instances" dev="tracefs" ino=4194 scontext=u:r:dump_display_userdebug:s0 tcontext=u:object_r:debugfs_tracing_instances:s0 tclass=dir permissive=1
[ 1198.908565] type=1400 audit(1728067746.876:2075): avc:  denied  { read } for  comm="cat" name="trace" dev="tracefs" ino=167692 scontext=u:r:dump_display_userdebug:s0 tcontext=u:object_r:debugfs_tracing_instances:s0 tclass=file permissive=1
[ 1198.909716] type=1400 audit(1728067746.876:2076): avc:  denied  { open } for  comm="cat" path="/sys/kernel/tracing/instances/pixel-display/trace" dev="tracefs" ino=167692 scontext=u:r:dump_display_userdebug:s0 tcontext=u:object_r:debugfs_tracing_instances:s0 tclass=file permissive=1

Bug: 369099258
Test: pixel display trace visible in bugreport
Flag: EXEMPT bugfix
Change-Id: I53f9340aee155d1ff0d0c0bc2db45e6bd77f342a
Signed-off-by: Taylor Nelms <tknelms@google.com>
diff --git a/display/sepolicy/dump_display_userdebug.te b/display/sepolicy/dump_display_userdebug.te
index a3f83bb..c08fb29 100644
--- a/display/sepolicy/dump_display_userdebug.te
+++ b/display/sepolicy/dump_display_userdebug.te
@@ -1,3 +1,4 @@
+# Display eng/userdebug (dump for bugreport)
 pixel_bugreport(dump_display_userdebug)
 
 userdebug_or_eng(`
@@ -5,4 +6,6 @@
   allow dump_display_userdebug vendor_log_file:dir search;
   allow dump_display_userdebug vendor_hwc_log_file:dir r_dir_perms;
   allow dump_display_userdebug vendor_hwc_log_file:file r_file_perms;
+  allow dump_display_userdebug debugfs_tracing_instances:dir search;
+  allow dump_display_userdebug debugfs_tracing_instances:file r_file_perms;
 ')