Revert "[1/2] SystemUI: Add time-context headers to the notification header"

This reverts commit 238dd53615406bfcd5ba6e25a2b0b76541da3a2a.

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/drawable-hdpi/notifhead_afternoon.jpg
	packages/SystemUI/res/drawable-hdpi/notifhead_christmas.jpg
	packages/SystemUI/res/drawable-hdpi/notifhead_morning.jpg
	packages/SystemUI/res/drawable-hdpi/notifhead_newyearseve.jpg
	packages/SystemUI/res/drawable-hdpi/notifhead_night.jpg
	packages/SystemUI/res/drawable-xhdpi/notifhead_afternoon.jpg
	packages/SystemUI/res/drawable-xhdpi/notifhead_christmas.jpg
	packages/SystemUI/res/drawable-xhdpi/notifhead_morning.jpg
	packages/SystemUI/res/drawable-xhdpi/notifhead_newyearseve.jpg
	packages/SystemUI/res/drawable-xhdpi/notifhead_night.jpg
	packages/SystemUI/res/drawable-xxhdpi/notifhead_afternoon.jpg
	packages/SystemUI/res/drawable-xxhdpi/notifhead_christmas.jpg
	packages/SystemUI/res/drawable-xxhdpi/notifhead_morning.jpg
	packages/SystemUI/res/drawable-xxhdpi/notifhead_newyearseve.jpg
	packages/SystemUI/res/drawable-xxhdpi/notifhead_night.jpg
	packages/SystemUI/src/com/android/systemui/crdroid/StatusHeaderMachine.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

Change-Id: Id795cd3dc24c84fbe8fd51d803e85dee1f43aa7b