[Realtek] fix confict

Author: pankore

.gitmodules

@@ -349,6 +349,11 @@
 	path = third_party/re2/src
 	url = https://github.com/google/re2.git
 	platforms = linux,darwin
+[submodule "third_party/libdatachannel/repo"]
+	path = third_party/libdatachannel/repo
+	url = https://github.com/paullouisageneau/libdatachannel.git
+	platforms = linux
+	recursive = true
 [submodule "third_party/openthread/ot-realtek"]
 	path = third_party/openthread/ot-realtek
 	url = https://github.com/rtkconnectivity/ot-realtek.git