Fix bug where dismiss() was being called from the wrong thread

One-way calls to binder do not guarantee the call will always
occur on the originating thread.  This fixes a rare case where
keyguard would crash due to dismiss() being called from the wrong
thread.

Fixes bug 11065316

Change-Id: Iddd281964231a152e3342e21b6b88527eab94caf
1 file changed