hammerhead: Remove TARGET_USES_C2D_COMPOSITION flag

Change-Id: I99002a22a106fcb4a8ae1da02c4de5e4d33a0d80
Permit install on bootloader HHZ12d

(Lollipop preview installs HHZ12d)

Change-Id: Ic69124b59e99244e3b82788c5c3a712421d7ce42