[AWARE] Simplify Wi-Fi Aware API namespace

Simplify Wi-fi Aware API namespace. Rely on project and remove WifiAware
prefix from most classes.

(pure rename operation: no functional changes)

Bug: 31470256
Test: unit-tests + integration (sl4a) tests.
Change-Id: I38b8137c1730c8f40c482c6770caafcaeafd5c46
16 files changed