MFC r306262, r306267, r310021: (needed to avoid conflicts on later merges)
Remove bus_dma_get_range and bus_dma_get_range_nb on armv6. We only need this on a few earlier arm SoCs. Restrict where we need to define fdt_fixup_table to just PowerPC and Marvell. Add the missing void to function signatures in much of the arm code.