[AWARE] Support multiple NDPs on an NDI

Support multiple NAN data-paths (NDPs) on a single NAN data-interface
(NDI). Interface bring-up and bring-down should be tied to first NDP
and last NDP.

Bug: 63635780
Test: unit tests and integrated (sl4a) tests pass (or bugs filed)
Change-Id: I05ac824e551d33897eba7b7e0d5ab45b56492558
4 files changed