Fix the device been wake up after dozing.

The real device would be wake up after dozing because of hiding
bouncer.
The sequence would be like:
DozeServiceHost#updateDozing
StatusBarKeyguardViewManager#reset
StatusBarKeyguardViewManager#hideBouncer.

And if the expansion state is EXPANSION_VISIBLE, hide bouncer will
overwrite the expansion to EXPANSION_HIDDEN, which would cause
KeyguardBouncer#dispatchFullyShown then wakeup the device.
A simple idea is we don't need to overwrite the expansion state while
hide bouncer since dispatchExpansionChanged can be triggerred when
setExpansion been called.

Bug: 175423965
Bug: 175920249
Test: atest KeyguardTests
Change-Id: I911ed31ccb402713eb0a00faf0b176c88488501b