[Mellanox] [SIMX] Disable cpu_pack and comex_amb for SN5640 and SN5600 (sonic-net#591)

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#### Why I did it
Mellanox SN5600, SN5640 SIMX platform does not support cpu thermal sensors

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it
Update DEVICE_DATA configuration for the SIMX platform

#### How to verify it
Check no error exists in syslog

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Author: mssonicbld

platform/mellanox/mlnx-platform-api/sonic_platform/device_data.py

@@ -162,9 +162,18 @@ class DpuInterfaceEnum(Enum):
             'fw_control_ports': [64]  # 0 based sfp index list
         }
     },
+    'x86_64-nvidia_sn5600_simx-r0': {
+        'thermal': {
+            "capability": {
+                "cpu_pack": False,
+                "comex_amb": False,
+            }
+        }
+    },
     'x86_64-nvidia_sn5640_simx-r0': {
         'thermal': {
             "capability": {
+                "cpu_pack": False,
                 "comex_amb": False,
             }
         }