hv: not start vm automatically when reset vm

For UOS, there is no BSP init state saved in hv. We always need
DM to set BSP init state by using hypercall. So we can't auto
start vm during vm reset.

Tracked-On: #1231
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/arch/x86/guest/vm.c

@@ -315,7 +315,6 @@ int reset_vm(struct vm *vm)
 	destroy_secure_world(vm, false);
 	vm->sworld_control.flag.active = 0UL;
 
-	start_vm(vm);
 	return 0;
 }