loongarch/kvm: disable hugepage during migration process

LoongArch inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8I4BU



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When VM is migrating, it will record dirty page and copy new page
to destination vm. With huge page dirty huge page is 32M, it
causes vm faling to migrate.

Hugepage is disabled during vm migration.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>