Add multi-asic support for test-intf-fec (sonic-net#17814)

Description of PR
Summary: Add multi ASIC support for test-intf-fec. This is possible with the utility command update in sonic-net/sonic-utilities#3819
Fixes # (issue) 28838870

Approach
What is the motivation for this PR?
Described

How did you do it?
Update the command from sonic-net/sonic-utilities#3819 and update the code base so that works with T2. For 202405

Please note that for a release branch to work internally, the following PR here needs to be included:

sonic-net#17183
sonic-net#14661
sonic-net#16424
sonic-net#15481

How did you verify/test it?
T2 platform verified

Signed-off-by: Austin Pham <[email protected]>

---------

Signed-off-by: Austin Pham <[email protected]>

Author: auspham

tests/platform_tests/test_intf_fec.py

@@ -15,7 +15,8 @@
     "mlnx_msn",
     "8101_32fh",
     "8111_32eh",
-    "arista"
+    "arista",
+    "x86_64-88_lc0_36fh_m-r0"
 ]
 
 SUPPORTED_SPEEDS = [
@@ -78,8 +79,10 @@ def test_config_fec_oper_mode(duthosts, enum_rand_one_per_hwsku_frontend_hostnam
         if fec_mode == "n/a":
             pytest.fail("FEC status is N/A for interface {}".format(intf))
 
-        config_status = duthost.command("sudo config interface fec {} {}"
-                                        .format(intf, fec_mode))
+        asic_cli_option = duthost.get_port_asic_instance(intf).cli_ns_option
+
+        config_status = duthost.command("sudo config interface {} fec {} {}"
+                                        .format(asic_cli_option, intf, fec_mode))
         if config_status:
             pytest_assert(wait_until(30, 2, 0, duthost.is_interface_status_up, intf),
                           "Interface {} did not come up after configuring FEC mode".format(intf))
@@ -177,7 +180,9 @@ def get_fec_histogram(duthost, intf_name):
     """
     try:
         logging.info("Get output of 'show interfaces counters fec-histogram {}'".format(intf_name))
-        fec_hist = duthost.show_and_parse("show interfaces counters fec-histogram {}".format(intf_name))
+        asic_cli_option = duthost.get_port_asic_instance(intf_name).cli_ns_option
+        fec_hist = duthost.show_and_parse("show interfaces counters fec-histogram {} {}".format(asic_cli_option,
+                                                                                                intf_name))
     except Exception as e:
         logging.error("Failed to execute 'show interfaces counters fec-histogram {}': {}".format(intf_name, e))
         pytest.skip("Command 'show interfaces counters fec-histogram {}' not found \