Autofill Better Request ID

Modifies Request ID to have the following characteristics:

1. Small enough to have a bunch of collisions between devices - this is
   done by truncate it to 16 bits (% 0xFFFF)
2. Unique within the same device - so it still works as expected

Fixes: 342013721
Test: tdb
Change-Id: I86f627b842fc614d992b11be2e1b13a81af9b65a