GateKeeper uses userids to key authentication data. This poses a problem
for GSIs, since both the GSI and the host image will be storing separate
authentication data for the same userids.
To account for this, we add a large offset (1000000) to GSI userids
before handing them off to the GateKeeper HAL. Note that
SyntheticPasswordManager uses a similar trick to store Weaver data in
GateKeeper (when a Weaver HAL is not available).
Bug: 123716647
Test: PIN authentication works after booting into a GSI
Change-Id: I714368919f8e46ff1931f350342f09fa09225a35
David Anderson
Dan Willemsen