exynos4: getphys implementation on buffermanager for samsung omx

Conflicts:

	libs/ui/GraphicBufferMapper.cpp

Change-Id: I9f612850793e4f83515f27f9d322f14260aec11d
ui: exynos4: getphys is common

Conflicts:

	include/ui/GraphicBufferMapper.h
	libs/ui/GraphicBufferMapper.cpp

Change-Id: I8b5e1b0b22cdcd2ede0fe14f537b1bd631b98504