Revert "HWC: Check for proper MDP version to enable C2D comp"

This reverts commit 88e2b9cef6827506467599995e921374ff334ee0.

Change-Id: Ie8b337a542dca223d7476ca5cd1eb50961dc1b15
hwc: make C2D composition conditional based on compile time flag

* The original check seems to do a very poor job of checking whether
  this code path should be used. Make this a compile time option such
  that devices which need this can select it for themselves.

Change-Id: I54f685effe366cd409e59ac5e8984b3028208072