perf trace: Beautify the 'flags' arg of unlinkat

Reusing the fs_at_flags array done for the 'stat' syscall.
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/20240320193115.811899-5-acme@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

@@ -1171,7 +1171,9 @@ static const struct syscall_fmt syscall_fmts[] = {
 	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* name */ }, }, },
 	{ .name	    = "uname", .alias = "newuname", },
 	{ .name	    = "unlinkat",
-	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
+	  .arg = { [0] = { .scnprintf = SCA_FDAT,	  /* dfd */ },
+		   [1] = { .scnprintf = SCA_FILENAME,	  /* pathname */ },
+		   [2] = { .scnprintf = SCA_FS_AT_FLAGS,  /* flags */ }, }, },
 	{ .name	    = "utimensat",
 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ }, }, },
 	{ .name	    = "wait4",	    .errpid = true,