hypervisor: Introduce mshv module in the hypervisor

This is the initial folder structure of the mshv module inside
the hypervisor crate. The aim of this module is to support Microsoft
Hyper-V as a supported Hypervisor.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

vmm/Cargo.toml

@@ -10,6 +10,7 @@ acpi = ["acpi_tables","devices/acpi", "arch/acpi"]
 cmos = ["devices/cmos"]
 fwdebug = ["devices/fwdebug"]
 kvm = ["hypervisor/kvm"]
+mshv = ["hypervisor/mshv"]
 io_uring = ["virtio-devices/io_uring"]
 
 [dependencies]