Revert "x86: kvm: rate-limit global clock updates"

Revert "x86: kvm: rate-limit global clock updates"

This reverts commit 7e44e4495a398eb553ce561f29f9148f40a3448f.

Commit 7e44e4495a39 ("x86: kvm: rate-limit global clock updates")
intends to use a kvmclock_update_work to sync ntp corretion
across all vcpus kvmclock, which is based on commit 0061d53daf26f
("KVM: x86: limit difference between kvmclock updates")

Since kvmclock has been switched to mono raw, this commit can be
reverted.

Signed-off-by: Lei Chen <lei.chen@smartx.com>
Link: https://patch.msgid.link/20250819152027.1687487-3-lei.chen@smartx.com
Signed-off-by: Sean Christopherson <seanjc@google.com>