Made a few logcat spammers STFU

Change-Id: Ic09f162211c81c025ac625ddfcabe2d2b02e1da3
SystemUI: update nav bar keyguard logic

More consistant with statusbar transparency logic.

Change-Id: Ieba5e695417f2c0a7e34805a21c7b198274ccf83
Signed-off-by: Roman Birg <romanbirg@gmail.com>