sw64: pci: align the address of mmio resource to PAGE_SIZE

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56WV8



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Considering that when mmio of the passthrough device establishes a
page table mapping, it cannot be in the same page as the emulated
mmio address, so the page size is used as boundary when allocating
the mmio address resource.

Signed-off-by: Lu Feifei <lufeifei@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>