hv: vm: minor fix about vRTC

For prelaunched VM, Service OS and postlaunched RT VM, we only need the vRTC
provides backed-up date, so we could use the simple vRTC which implemented
in hypervisor. For postlaunched VM (which is not a RT VM), we needs the device
module to emulate the vRTC for it.

Tracked-On: #1842
Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Reviewed-by: Yu Wang <yu1.wang@intel.com>

Author: lifeix

hypervisor/arch/x86/guest/vm.c

@@ -417,7 +417,9 @@ int32_t create_vm(uint16_t vm_id, struct acrn_vm_config *vm_config, struct acrn_
 		/* Create virtual uart;*/
 		vuart_init(vm, vm_config->vuart);
 
-		vrtc_init(vm);
+		if (is_rt_vm(vm) || !is_postlaunched_vm(vm)) {
+			vrtc_init(vm);
+		}
 
 		vpci_init(vm);