Keyguard: don't refresh ui when screen off KeyguardStatusView is doing refresh all the time, which cause high power when screen off.

Original commit: https://android-review.googlesource.com/#/c/78853/

Change-Id: Iaca0c01947bb372f1c5a18c78a50ff788f89a53d
Merge "Keyguard: don't refresh ui when screen off KeyguardStatusView is doing refresh all the time, which cause high power when screen off." into kitkat