The dmabuf APIs are now fully supported upstream. Since Ion is now a dmabuf exporter, there is no need to call those APIs directly. Switch to calling the dmabuf APIs to generate scattergather lists for mapping to be more compatible. Change-Id: Ie393e74bba080cba8a10e60908af7932729e6da6 Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Ling Wan <lingw@codeaurora.org>