Fix tofino-demo.json

deviceId should be zero

Change-Id: Ibce0f7b82bec611214cbbbef33dd78c34d2fee6b
diff --git a/tools/test/topos/tofino-demo.json b/tools/test/topos/tofino-demo.json
index d992970..8c4684d 100644
--- a/tools/test/topos/tofino-demo.json
+++ b/tools/test/topos/tofino-demo.json
@@ -6,7 +6,7 @@
                   "ip": "10.254.1.40",
                   "deviceKeyId": "p4runtime:device:tofino:21",
                   "port": 50051,
-                  "deviceId": 21
+                  "deviceId": 0
               }
           },
           "piPipeconf": {
@@ -43,7 +43,7 @@
                   "ip": "10.254.1.39",
                   "deviceKeyId": "p4runtime:device:tofino:22",
                   "port": 50051,
-                  "deviceId": 22
+                  "deviceId": 0
               }
           },
           "piPipeconf": {
@@ -80,7 +80,7 @@
                   "ip": "10.254.1.38",
                   "deviceKeyId": "p4runtime:device:tofino:11",
                   "port": 50051,
-                  "deviceId": 11
+                  "deviceId": 0
               }
           },
           "piPipeconf": {
@@ -125,7 +125,7 @@
                   "ip": "10.254.1.37",
                   "deviceKeyId": "p4runtime:device:tofino:12",
                   "port": 50051,
-                  "deviceId": 12
+                  "deviceId": 0
               }
           },
           "piPipeconf": {