[chassis]update the way to get the chassis name to using onie_platfor…

…m info

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

@@ -11,6 +11,7 @@
 try:
     from sonic_platform_base.chassis_base import ChassisBase
     from sonic_platform_base.component_base import ComponentBase
+    from sonic_device_util import get_machine_info
     from sonic_daemon_base.daemon_base import Logger
     from os import listdir
     from os.path import isfile, join
@@ -54,7 +55,11 @@ def __init__(self):
 
         # Initialize SKU name
         self.sku_name = self._get_sku_name()
-        self.name = self.sku_name
+        mi = get_machine_info()
+        if mi is not None:
+            self.name = mi['onie_platform']
+        else:
+            self.name = self.sku_name
 
         # move the initialization of each components to their dedicated initializer
         # which will be called from platform