[SmartSwitch] Skip xcvrd on the DPU (sonic-net#20960)

- Why I did it
Data port on the DPU is of type "Dpc" i..e no xcvr is present on it. Thus xcvrd can effectively be skipped on this platform

- How I did it
change the pmon configuration
"skip_ycabled": true,
"skip_xcvrd": true

- How to verify it
Manual test to ensure xcrvd is skipped for this type of ports.
Load and check if xcvrd is not started

device/nvidia-bluefield/arm64-nvda_bf-bf3comdpu/pmon_daemon_control.json

@@ -3,5 +3,6 @@
     "skip_psud": true,
     "skip_fancontrol": true,
     "skip_chassisd": false,
-    "skip_ycabled": true
+    "skip_ycabled": true,
+    "skip_xcvrd": true
 }