monitor: Remove uuid128_to_str

uuid128_to_str is no longer necessary since all the user have been
converted to use uuidstr_to_str.
diff --git a/monitor/uuid.c b/monitor/uuid.c
index 1ceaa6f..6660bc7 100644
--- a/monitor/uuid.c
+++ b/monitor/uuid.c
@@ -585,11 +585,6 @@
 	return "Unknown";
 }
 
-const char *uuid128_to_str(const unsigned char *uuid)
-{
-	return "Unknown";
-}
-
 const char *uuidstr_to_str(const char *uuid)
 {
 	uint32_t val;
diff --git a/monitor/uuid.h b/monitor/uuid.h
index f467f51..6ffc0ee 100644
--- a/monitor/uuid.h
+++ b/monitor/uuid.h
@@ -26,6 +26,4 @@
 
 const char *uuid16_to_str(uint16_t uuid);
 const char *uuid32_to_str(uint32_t uuid);
-const char *uuid128_to_str(const unsigned char *uuid);
-
 const char *uuidstr_to_str(const char *uuid);