keyguard: fix delay lock screen sound

Change-Id: Ia4cd2c856df1573856386e1597dcc0a9600d25a5
JIRA: CYAN-3362
Issue: https://jira.cyanogenmod.org/browse/CYAN-3362
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge https://github.com/CarbonDev/android_frameworks_base into kk44