Make change and version bump to r_aml_300900300 for mainline module file: packages/Tethering/apex/manifest.json

Change-Id: Ic95844fa021e178f665d3cc74e795e510cee29db
tree: d6f64c1d0db8997c0c6e3f9bc0e24f52b1294f93
  1. Tethering/