hv: remove mptable code for pre-launched VMs

Now that ACPI is enabled for pre-launched VMs, we can remove all mptable code.

Tracked-On: #3601
Signed-off-by: dongshen <dongsheng.x.zhang@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/arch/x86/guest/vm.c

@@ -742,7 +742,6 @@ void prepare_vm(uint16_t vm_id, struct acrn_vm_config *vm_config)
 
 	if (err == 0) {
 		if (is_prelaunched_vm(vm)) {
-			(void)mptable_build(vm);
 			build_vacpi(vm);
 		}