ARCH_DMA_ADDR_T_64BIT is always true for 64-bit architectures now, so we
can skip the clause requiring it.  'n' is the default default, so no need
to explicitly state it.
Tested-by: NAlexey Brodkin <abrodkin@synopsys.com>
Acked-by: NVineet Gupta <vgupta@synopsys.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>