Rename xlookup64 to xlookup

* defs.h (xlookup): Remove.
(xlookup64): Rename to xlookup.
* util.c (xlookup64): Rename to xlookup.
diff --git a/util.c b/util.c
index b0757a8..f197d09 100644
--- a/util.c
+++ b/util.c
@@ -121,7 +121,7 @@
 }
 
 const char *
-xlookup64(const struct xlat *xlat, const uint64_t val)
+xlookup(const struct xlat *xlat, const uint64_t val)
 {
 	for (; xlat->str != NULL; xlat++)
 		if (xlat->val == val)