Update chef.py (#32060)

diff --git a/examples/chef/chef.py b/examples/chef/chef.py
index 47d3c7a..688bdfe 100755
--- a/examples/chef/chef.py
+++ b/examples/chef/chef.py
@@ -730,7 +730,7 @@
             shell.run_cmd(" ".join(nrf_build_cmds))
 
         elif options.build_target == "silabs-thread":
-            shell.run_cmd(f"cd {_CHEF_SCRIPT_PATH}/efr32")
+            shell.run_cmd(f"cd {_CHEF_SCRIPT_PATH}/silabs")
             if options.do_clean:
                 shell.run_cmd(f"rm -rf out/{options.sample_device_type_name}")
             efr32_cmd_args = []