sw64: vfio: select VFIO_IOMMU_TYPE1 as default

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


CVE: NA

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The sunway iommu driver is compatible with the notion of a type-1 IOMMU
in VFIO.

This patch allows VFIO_IOMMU_TYPE1 to be selected if SW64=y.

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>