Cleanup empty class in NetworkPermissionConfig am: a46f16d7ec am: c035a4f6c1 am: 918c68cf07 am: 88dcc206b3

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkPermissionConfig/+/1836236

Change-Id: I7c678a724bff481b286a7dd78b8e655f00268b76