add special case to compute aac network birate

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index 07824fcf3879d265c59beaf970d833b5859f3691..23b802c4631fdf909a218a0dd0a77c6cf6d4d5a9 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 07824fcf3879d265c59beaf970d833b5859f3691
+Subproject commit 23b802c4631fdf909a218a0dd0a77c6cf6d4d5a9