exynos4: getphys implementation on buffermanager for samsung omx

Conflicts:
	include/media/hardware/HardwareAPI.h
	include/ui/GraphicBufferMapper.h
	libs/ui/GraphicBufferMapper.cpp

Conflicts:
	libs/ui/GraphicBufferMapper.cpp

Change-Id: I88db141e29a50986bee8d9555d145d1f92ea6ecf