Add individual API tracking files for modules

This adds metalava api tracking generation to the module
stub rules, to make sure we know exactly what API a
particular module stub exports.

Bug: 147768409
Test: m update-api check-api
Exempt-From-Owner-Approval: approved internally
Change-Id: Iaf2ef5b5751eb208d119ddbc74481239366fe581
Merged-In: Iaf2ef5b5751eb208d119ddbc74481239366fe581
(cherry picked from commit e7c52c7e3f056af3d766bfbb512d8c2b8897a570)
diff --git a/Tethering/common/TetheringLib/api/removed.txt b/Tethering/common/TetheringLib/api/removed.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/Tethering/common/TetheringLib/api/removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0