sw64: iommu: fix a bug in calling 'alloc_pages_node'

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SPZD


CVE: NA

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The node id of hose is used to denote topological physical id of PCI
host bridge, however one may start up the machine by command line
'numa=off' to switch off NUMA system, and this case may raise exception
on the node id passed to alloc_pages_node, so let's use dev_to_node(dev)
instead and ensure the correctness of the parameter passed in.

Signed-off-by: Gu Zitao <guzitao@wxiat.com> #openEuler_contributor
Signed-off-by: Laibin Qiu <qiulaibin@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>