Revert "Quicksettings: USB Tether tile"

courtesy of OmniRom
based on: http://goo.gl/0RfbFy

PS3: add "private ConnectivityManager mCM;" variable
PS4: compiles, not yet tested
PS5: derp forgot to initialize mCM which caused a NPE
(http://developer.android.com/reference/android/net/ConnectivityManager.html)
PS6: fixed some connectivity manager redundancies in qs.java

Signed-off-by: Andre Saddler <dresadd09691@gmail.com>
Change-Id: I856f1a1f954544cb9e1b78f504fde8916b94235e

Conflicts:
	packages/SystemUI/res/values/pa_strings.xml (reverted from commit 7a637cc46c3d7a05b954d20772ed9eb82e2f1afe)