Allow extra keyguard logs to be enabled via adb

To enable extra logs:
adb shell setprop log.tag.Keyguard DEBUG && adb shell am crash com.android.systemui

Test: manually enable logs, check they show in logcat
Bug: 212835832
Change-Id: I29bb0ffefd57d577b5abe942e227eb2b5baeab4e
1 file changed