SystemUI: fix hidden clock style after a reboot

Selecting hidden clock style and rebooting the device results
in both center and default clocks appearing when you'd expect
to see none.

mClockView is null after a reboot so visibility gets never set.
Set default visibility for clocks to gone.

Change-Id: I533af8c28042a5989e0025df133c9ccf1fa3e066
Filter spam notifications

Change-Id: Ibf2377cd7491c7e0e9e9c9657e9e65eef1876ee3
Merge pull request #6 from CyanogenMod/cm-11.0

sync fork