base

Properly handle non split system user when showing bouncer

For system user, there should be no atempt to dismiss keyguard,
but only if system user is split (i.e. not a meat user).

Change-Id: Ia2c1e7a3e197c5be72446f21b3883e853485ff26
(cherry picked from commit aa401afb4cdfd5bab441e633aee801c2a127aec2)