Revert "Revert "remove support for HWC < 1.0""

This reverts commit 6efc967ff5e0bb33a9116aee9846b041b80d0594.

Conflicts:
	services/surfaceflinger/DisplayHardware/HWComposer.cpp

This causes weird few second lag on screen-on.

Change-Id: I7ad5959a7cb56eef6b86c7145af3e6b4161d110f