For modules to reuse default dma_map_ops implementations they need to be exported. Export the following functions: dma_direct_alloc dma_direct_free dma_common_mmap dma_common_get_sgtable dma_direct_get_required_mask Bug: 151050914 Signed-off-by: Suren Baghdasaryan <surenb@google.com> Change-Id: Ia77b797fcd909fce01da7431bfbde282dc70b3b3