Revert "remove recents memory indicator from settings(2/2)"

This reverts commit 521fab14c15da793186a56fbc9905f6bd00e3e49.

Change-Id: I97f463ee2c310f4a420fa17159200b313f429ff1
Merge "Revert "remove recents memory indicator from settings(2/2)"" into android-4.4