Added query of hipDeviceAttributeHdpMemFlushCntl and hipDeviceAttribu… (#1238)

* Added query of hipDeviceAttributeHdpMemFlushCntl and hipDeviceAttributeHdpRegFlushCntl

* Added NVCC blocker for the hip*FlushCntl test cases

src/hip_device.cpp

@@ -293,6 +293,17 @@ hipError_t ihipDeviceGetAttribute(int* pi, hipDeviceAttribute_t attr, int device
                 break;
             case hipDeviceAttributeMaxTexture3DDepth:
                 *pi = prop->maxTexture3D[2];
+            case hipDeviceAttributeHdpMemFlushCntl:
+                {
+                    uint32_t** hdp = reinterpret_cast<uint32_t**>(pi);
+                    *hdp = prop->hdpMemFlushCntl;
+                }
+                break;
+            case hipDeviceAttributeHdpRegFlushCntl:
+                {
+                    uint32_t** hdp = reinterpret_cast<uint32_t**>(pi);
+                    *hdp = prop->hdpRegFlushCntl;
+                }
                 break;
             default:
                 e = hipErrorInvalidValue;