x64: Remove VMware hypervisor probing

This removes the VMware hypervisor probing introduced in commit 7cb1ddf
("Hypervisor API: VMware support") because people are reporting that it
causes boot issues on some Amazon EC2 instance types.

Reported-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>