Define intent for receive vendor specific response and define a function to send vendor AT command from Hfp client

Bug: 132813146

Test: Local test with Kitchensink: able to send vendor command and
receive response.

Change-Id: I9a6debbacb1a5ad6445416c067d3d35849906685
1 file changed
tree: 8a1fa3ff351aae35579ebaa316c9b1f16ada5170
  1. framework/
  2. service/