PCI: add 64-bit prefetchable memory support
PCI specification allow prefetchable memory to be 32-bit or 64-bit. PCI express specification states that all memmory bars for prefetchable memory must be implemented as 64-bit. They all require that 64 bit prefetchble memory are suported especially when u-boot is ported to more and more 64bit processors. Signed-off-by: NDavid Feng <fenghua@phytium.com.cn> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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