GPU: rename use-nvml to driver-specific

Because we are supporting drivers other than NVML

doc/json_schema.json

@@ -1191,8 +1191,8 @@
                                         "type": "boolean",
                                         "default": false
                                     },
-                                    "useNvml": {
-                                        "description": "Use nvml (NVIDIA Management Library) to detect more detailed GPU information (memory usage, CUDA core count, etc)",
+                                    "driverSpecific": {
+                                        "description": "Use driver specific method to detect more detailed GPU information (memory usage, core count, etc)",
                                         "type": "boolean",
                                         "default": false
                                     },