gralloc: Add backwards-compatible gralloc
	modified:   libcopybit/copybit_c2d.cpp
	modified:   libexternal/external.cpp
	modified:   libhwcomposer/hwc.cpp
	modified:   libhwcomposer/hwc_ad.cpp
	modified:   libhwcomposer/hwc_copybit.cpp
	modified:   libhwcomposer/hwc_fbupdate.cpp
	modified:   libhwcomposer/hwc_mdpcomp.cpp
	modified:   libhwcomposer/hwc_mdpcomp.h
	modified:   libhwcomposer/hwc_utils.cpp
	modified:   libhwcomposer/hwc_utils.h
	modified:   libhwcomposer/hwc_vsync.cpp
	modified:   liboverlay/overlay.cpp
	modified:   liboverlay/overlay.h
	modified:   liboverlay/overlayMdpRot.cpp
	modified:   liboverlay/overlayMdssRot.cpp
	modified:   liboverlay/overlayRotator.cpp
	modified:   liboverlay/overlayRotator.h
	modified:   liboverlay/overlayUtils.cpp
	modified:   liboverlay/overlayUtils.h
	modified:   libqdutils/idle_invalidator.cpp
	modified:   libqdutils/mdp_version.cpp
	modified:   libqdutils/mdp_version.h
	modified:   libvirtual/virtual.cpp