[Mellanox] Add Mellanox-SN5610N-C256S2, Mellanox-SN5610N-C224O8 to GCU validators (#3718)

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#### What I did
Add Mellanox-SN5610N-C256S2, Mellanox-SN5610N-C224O8 to GCU validators
#### How I did it
Add Mellanox-SN5610N-C256S2 and Mellanox-SN5610N-C224O8 SKUs to generic_config_updater/gcu_field_operation_validators.conf.json
#### How to verify it
Deploy an image on SN5610N with one of the mentioned SKUs
#### Previous command output (if the output of a command-line utility has changed)
N/A
#### New command output (if the output of a command-line utility has changed)
N/A

Author: mssonicbld

generic_config_updater/gcu_field_operation_validators.conf.json

@@ -22,7 +22,7 @@
                 "spc2": [ "ACS-MSN3800", "Mellanox-SN3800-D112C8", "ACS-MSN3420", "ACS-MSN3700C", "ACS-MSN3700", "Mellanox-SN3800-C64", "Mellanox-SN3800-D100C12S2", "Mellanox-SN3800-D24C52", "Mellanox-SN3800-D28C49S1", "Mellanox-SN3800-D28C50" ],
                 "spc3": [ "ACS-MSN4700", "ACS-MSN4600", "ACS-MSN4600C", "ACS-MSN4410", "ACS-SN4280", "Mellanox-SN4600C-D112C8", "Mellanox-SN4600C-C64", "Mellanox-SN4700-O8C48", "Mellanox-SN4600C-D100C12S2", "Mellanox-SN4600C-D48C40","Mellanox-SN4700-O32","Mellanox-SN4700-V64",
                           "Mellanox-SN4700-A96C8V8", "Mellanox-SN4700-C128", "Mellanox-SN4700-O28", "Mellanox-SN4700-O8V48", "Mellanox-SN4700-V48C32", "Mellanox-SN4280-O28"],
-                "spc4": [ "ACS-SN5600", "Mellanox-SN5600-O128", "Mellanox-SN5600-V256", "Mellanox-SN5600-C256S1", "ACS-SN5400", "Mellanox-SN5600-C224O8" ],
+                "spc4": [ "ACS-SN5600", "Mellanox-SN5600-O128", "Mellanox-SN5600-V256", "Mellanox-SN5600-C256S1", "ACS-SN5400", "Mellanox-SN5600-C224O8", "Mellanox-SN5610N-C256S2", "Mellanox-SN5610N-C224O8" ],
                 "spc5": ["ACS-SN5640"]
             },
             "broadcom_asics": {