Revert "Revert "No recent apps: use white, not holo blue light.""

This reverts commit 77e1eaf14b5d19edc4c638498a443358bfdfdab8.
Revert "Revert "Use white switch thumb activated drawables, not holo blu light.""

This reverts commit 7c70418c87ceeeb3db21f654808ecd9da9151e28.
Add xxhdpi versions of our improved tethering icons

Change-Id: If943f81389774a1f8ca0407cab4756687a273be7
Improve tethering notification icons

Replaces the stock icons with the ones I submitted as part of
http://review.cyanogenmod.com/#/c/15930/ in CM9.

Change-Id: Iecfae9ad579c6c9ae06da0a08b61e9359a8a37b0