vtimer feature was added to qemu v4.0.1 to record timer tick when vcpu
is stopped. However this feature is discared and the new virtual time
adjustment is introduced.
This patch add the missing vtimer parameter to ARMCPUState in order
to compat cross version migration fromm v4.0.1 openEuler 2003 lts release.
Singed-off-by: Ying Fang <fangying1@huawei.com>
