Revert "Halo: tablet mode support"

Doesn't work yet.

This reverts commit 0587d0081b27d162efa066b221b3d499d4ecad12.
HALO: fix NPE for hdpi mdpi device

Change-Id: I472864ee82f4ea451918be10c349cd3b0acdd8fa
HALO: add hdpi and mdpi drawable

Change-Id: Ia19cdaf7eb008fd099d33168cc4724579ebe49c2