Remove clock seconds [1/2]

Revert "Clock: use mCalendar to get seconds"

This reverts commit 8eef10bb95173a74b00a4b9240aa44fe154dd090.

Revert "Show Seconds next to StatusBar Clock [1/2]"

This reverts commit 50c5872707e487f3402eead3de59cc216d488ec1.

Change-Id: I5e1ad1b1054cf133c53f2194877b29efc0a300f6