display: Revert some problematic changes for now.

 * Some devices are going to experience a vast array of problems while
   attempting to utilize these new features. Let's just revert for now
   to stop the insanity.

Revert "hwc: Rotate RGB layer using MDP Rotator"

This reverts commit 063d593d0de0390b1b830105373a9a83db4f2e52.

Revert "overlay: Change max rotator sessions to 4 and log level"

This reverts commit f658ca58fe5341e8867a76447bd361c066db345f.

Revert "hwc/overlay: Fix decimation / bwc bugs"

This reverts commit ef0cc725f855a1cbf1cfa5a79d6e048f2f554e27.

Change-Id: Id8dad791ee94d489b1e3763518f893e281f9dcc2