ch-release-v6.16.9-20261001

arch: Enable VMGENID for x86,arm64

The vmgenid driver reseeds the guest RNG when a VM is restored from a
snapshot, which the cloud-hypervisor VM Generation ID device drives.
The driver sits under VIRT_DRIVERS, so enable the menu and the driver
in both default configs.

CONFIG_VIRT_DRIVERS=y, CONFIG_VMGENID=y