Add option to view RAM as GB in Recents bar [2/2]

Change-Id: I28f2b1049d4494fc79347d6921c26fcaefed40e8
Signed-off-by: Chris Conley <chrisc93@vt.edu>

Conflicts:
	res/values/pac_strings.xml
	res/xml/recents_apps_panel.xml
	src/com/android/settings/slim/RecentsPanel.java