Allow google dialer code to be compiled against M and N SDKs for enterprise features

Following dialer's practice, use src-N and pre-N to separate implementation
in different build sdk

BUG=26312016

Change-Id: Ia9bd420cb2a96b1c31aa3ce2a61fd772b8811f2e
5 files changed
tree: 0e7833bf9544841cdccc98ca9b24eb0d48e6afc4
  1. src/
  2. TestCommon/
  3. tests/