Add network usage stats to status bar: Re-implement for 4.4 [1/2]

Conflicts:

	packages/SystemUI/res/layout/status_bar_center_clock.xml
	packages/SystemUI/res/values/vendor_dimens.xml
	packages/SystemUI/res/values/vendor_styles.xml

Change-Id: I7c64a81167d0fea1ccd0adc9ed41e38fc07a79b7