Revert "am: Allow more hidden apps on devices with lots of RAM"

 * This isn't actually needed on 4.2+

This reverts commit 03a420191d8063a8def901b1955b7c477185d62d.

Change-Id: I1c4ef3c9c00882bf2c36ad042c368bacc0f9220f
Merge branch 'cyanogenmod' into cm-10.1

Signed-off-by: Humberto Borba <humberos@gmail.com>