Revert "frameworks/base: Update quick launch shortcut icons/resources"

This reverts commit b9ed7deace8f7553de78dce7d10e9220907d9ceb.

Conflicts:
	core/res/res/values/symbols.xml

Change-Id: Ic8d0baa8a31c993c1f169b4a97326a155e79b3ff
frameworks/base: Update quick launch shortcut icons/resources

Update the existing icons and add "xxhdpi" versions created
from a vector template. This commit cleans also the resource
files a bit up.

Screenshot: http://goo.gl/6CrMYr

Change-Id: I45abee5cf13cd239eb5b4402019afac28d6d5952

Conflicts:
	core/java/com/android/internal/util/cm/NavigationRingConstants.java
	core/java/com/android/internal/util/cm/NavigationRingHelpers.java
	core/res/res/values/dimens.xml
	core/res/res/values/symbols.xml
	packages/SystemUI/src/com/android/systemui/cm/ActionTarget.java