[SYCL] support sycl::info::device::host_unified_memory similar to OpenCL (#2683)

Signed-off-by: Sergey V Maslov <sergey.v.maslov@intel.com>

Author: smaslov-intel

sycl/plugins/level_zero/pi_level_zero.cpp

@@ -1216,9 +1216,8 @@ pi_result piDeviceGetInfo(pi_device Device, pi_device_info ParamName,
   case PI_DEVICE_INFO_IMAGE_SUPPORT:
     return ReturnValue(pi_bool{ZeDeviceImageProperties.maxImageDims1D > 0});
   case PI_DEVICE_INFO_HOST_UNIFIED_MEMORY:
-    return ReturnValue(
-        // TODO[1.0]: how to query for USM support now?
-        pi_bool{true});
+    return ReturnValue(pi_bool{(Device->ZeDeviceProperties.flags &
+                                ZE_DEVICE_PROPERTY_FLAG_INTEGRATED) != 0});
   case PI_DEVICE_INFO_AVAILABLE:
     return ReturnValue(pi_bool{ZeDevice ? true : false});
   case PI_DEVICE_INFO_VENDOR: