sw64: kvm: turn off the clock timer of guest os

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5PNJ3



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During guest os reboot test, an error occurred by chance and the
hypervisor reports guest unknown hardware error.

The interrupt of guest os cannot be handled because the interrupt
route table of guest is empty during reboot time if interrupt are
enabled by mistake.

The problem of guest os reboot failures are significantly reduced
by turning off the clock timer.

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