Excluded a test source for efr32 due to lack of dirent.h

Author: feasel0

src/credentials/tests/BUILD.gn

@@ -56,7 +56,8 @@ chip_test_suite("tests") {
   ]
 
   # DUTVectors test requires <dirent.h> which is not supported on all platforms
-  if (chip_device_platform != "openiotsdk" && chip_device_platform != "nxp") {
+  if (chip_device_platform != "openiotsdk" && chip_device_platform != "nxp" &&
+      chip_device_platform != "efr32") {
     test_sources += [ "TestCommissionerDUTVectors.cpp" ]
   }