fix SoundTrigger overwriting session identity

SoundTrigger tracks client UID for every session. This CL fixes an issue
with client UID being saved twice causing the incorrect client UID to be
saved.

Bug: 171342256
Test: boot and verify hotword is functional
Change-Id: I68bba238293ed5a74f5a3677f21e5122cc444f82
3 files changed