libvirt: set clocksource to acpi_pm if kvm is not supported
libvirt: set clocksource to acpi_pm if kvm is not supported

tsc is not reliable in this case, especially if hyperd runs inside
a virtual machine itself, as in the hykins use case.

Signed-off-by: Peng Tao <39d8af57313740070ea49547576f55682fe5221a@gmail.com>

jinfenw/runv,gnawux/runv,jinfenw/runv,gao-feng/runv,laijs/runv,laijs/runv,hyperhq/runv,bergwolf/runv,gao-feng/runv,gnawux/runv,jinfenw/runv,feiskyer/runv,laijs/runv,gao-feng/runv,feiskyer/runv,bergwolf/runv,hyperhq/runv,bergwolf/runv,hyperhq/runv,gnawux/runv