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
(cherry picked from commit e835b9847e7ceb71b8181f3af9d2f7f5c6db652d)
3 files changed