ClockActions: Dismiss Keyguard

Kanging SteveSpear's Brilliant
    dismissal method here.
    Doesn't require an activity
    as ...OnNextActivity() does.

PS2: TabletStatusBar.java as well

Change-Id: I2e9a3d8e42f2cd2a41f954026d0e38fe40c5da67

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java