Add Thread team to owners of the API files

Similar to the Neary and RemoteAuth team, the Thread team will need to update the API files.

Change-Id: I488aae7610e337f14df01f1c6f51f042f11bd450
diff --git a/framework-t/api/OWNERS b/framework-t/api/OWNERS
index 607f85a..8ef735c 100644
--- a/framework-t/api/OWNERS
+++ b/framework-t/api/OWNERS
@@ -1,2 +1,3 @@
 file:platform/packages/modules/Connectivity:main:/nearby/OWNERS
 file:platform/packages/modules/Connectivity:main:/remoteauth/OWNERS
+file:platform/packages/modules/Connectivity:main:/thread/OWNERS