Revert "SystemUI: use regular bg for center clock for now"

This reverts commit 83b7e112deacbceffd2def5a502d80bfbb935dea.
Revert "Use wrap_content for Clock height in status_bar_center_clock so the clock is properly centered vertically."

This reverts commit 90147253ba884667465daeaeb5199ec7bbf6d34e.
Revert "[1/2] Add center clock."

This reverts commit fcb1f1163a297ff02cf94e45a57fb25d57f18c0c.

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

Change-Id: I32292d52ea86e1b149077ce8d4c2f53fc9562d44