[devices]: Dell S6100 API 2.0 fix (#16363)

Why I did it
sonic-mgmt test failure is seen for update_firmware component API

Microsoft ADO: 25208748

How I did it
Edited API 2.0 to fix this issue.

How to verify it
Run sonic-mgmt test after the fix and verify it passes.

platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/component.py

@@ -321,3 +321,16 @@ def install_firmware(self, image_path):
             A boolean, True if install was successful, False if not
         """
         return False
+
+    def update_firmware(self,image_path):
+       """
+         Updates firmware to the componenent
+
+        Args:
+            image_path: A string, path to firmware image
+
+        Returns:
+            A boolean, True if install was successful, False if not
+
+       """
+       return False