SystemUI: disable statusbar time refresh when screen off

When screen is off, don't refresh the status bar to save power.
When screen is on, refresh immediately for user experience.

Change-Id: Ie250e20bab57c096a16886680a53263c635bf6f4
Add key layout file for Microsoft Corp. Xbox 360 Wireless Adapter

Change-Id: Ieed2d277e3197767c37d63cff0cedb855ee4fb74
Signed-off-by: John Grub <g@greyltc.com>