VMware: deprecate ESX driver from virt configuration

Remove the VMware ESX driver configuration from the virt driver
configuration help options.

The commit d041b95b8977e77a51e6031c38f0011b44d3266a marked the
VMware ESX driver as deprecated. This is the first step in
starting to remove the driver in Juno.

Change-Id: I955ffee336feeca68994d9ea4e244f3c7e10eed2
Merge "VMware: deprecate ESX driver from virt configuration"