Obsfucate the input device uniq id.

In Android input device stats atom, obsfucate the device unique id, by
applying SHA256 HAMC and trim to 8 bytes.

Bug: 177445452
Test: statsd_testdrive 351
Change-Id: Ib1906f9722f707e96c3d8a7623343efdf4c638ac
1 file changed