[llvm-dwp] Add missing llvm-dwp tool in lit config tool substitution (#81217)

Author: Enna1

llvm/test/lit.cfg.py

@@ -190,6 +190,7 @@ def get_asan_rtlib():
         "llvm-dis",
         "llvm-dwarfdump",
         "llvm-dwarfutil",
+        "llvm-dwp",
         "llvm-dlltool",
         "llvm-exegesis",
         "llvm-extract",