Settings: Do not show the Quick pulldown option on Tablets

Change-Id: Ibc6ff5b334fc253da102e203fac781f80e079896
Fix switching running/cached apps with memory bar

Fixes upstream issue #38735
http://code.google.com/p/android/issues/detail?id=38735

Ported from CM10
http://review.cyanogenmod.org/25775

This patch is already submitted to AOSP. No feedback from them yet.

Change-Id: I484e30d3fd4f5425e174911ae22bb2def170e6b8