Revert: "hwc: Add conditional for use of retire fence"

 * This patch is only in AOSP, and requires specific support in the
   kernel. Add a conditional for devices that want to use it.

Change-Id: I7e0b7ee0ea2f58b82db1adc28c6cdd9eb4db2156 (reverted from commit 2f255dc1baaba643f92255b2f9656eb40e4a0bec)