adbd_auth: add missing headers to fix linux build

On Linux, trying to build `adbd` fails due to missing headers in
`adbd_auth.cpp` (tested on current Debian testing). Adding the `atomic`
and `optional` headers fixes this issue.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
Test: build adbd for linux
Change-Id: I9344ee571acbd1cecbcf3d5897cc5521c8e1d95f