[Mellanox] Enable get_rx_los API support in CMIS cable host mgmt mode (…

…#20743)

- Why I did it
The show int transceiver status PORT CLI always displays Rx LOS as False for all the lanes.

- How I did it
The current platform implementation assigns Rx LOS as False for all the lanes (irrespective of the actual status on the module) which in turn causes the show int transceiver status PORT CLI to display the Rx LOS as False for all the lanes.

Hence, removing the overriding part to ensure that the API is not overridden by the platform.

- How to verify it
Verified the CLI on first 2 lanes which are in admin disabled state from the peer side.

---------
Signed-off-by: Mihir Patel <[email protected]>

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

@@ -1074,6 +1074,11 @@ def get_rx_los(self):
             list: [False] * channels
         """
         api = self.get_xcvr_api()
+        try:
+            if self.is_sw_control():
+                return api.get_rx_los() if api else None
+        except Exception as e:
+            print(e)
         return [False] * api.NUM_CHANNELS if api else None
 
     def get_tx_fault(self):
@@ -1186,8 +1191,6 @@ def get_xcvr_api(self):
         """
         if self._xcvr_api is None:
             self.refresh_xcvr_api()
-            if self._xcvr_api is not None:
-                self._xcvr_api.get_rx_los = self.get_rx_los
         return self._xcvr_api
 
     def is_sw_control(self):