sw64: kvm: enable binding_vcpu debug dynamically

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GFR5



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Add a bool debugfs file /sys/kernel/debug/sw_64/bind_vcpu, you can
echo 1/Y to enable bind vcpu, or echo 0/N to disable it. Determin which
node to bind the core according to the physical address assigned to the
guest.

Signed-off-by: Wang Yuanheng <wangyuanheng@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>