There exists one definition for ion_map_iommu function when ION is enabled and one definition when ION is disabled. The argument list for the definition used when ION is disabled is missing the buffer_size argument causing compilation error for targets that call this function without ION enabled. Add buffer_size argument to ion_map_iommu function for targets that does not have ION enabled. Change-Id: Ie184e4a6dbec2bc3dff75ab3b25985fd64e2baac Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>