Make change and version bump to r_aml_300900000 for mainline module file: packages/Tethering/apex/manifest.json

Change-Id: If7bac499f32dabcb20f7482ac9e40bb73cd785db
tree: 51bb6a6fe3b39a9b6ceebce76beca8c08807bac3
  1. Tethering/