Merge "Error on suboptimal system server classpath order, unless explicitly...

Merge "Error on suboptimal system server classpath order, unless explicitly allowed." am: eb3f9f12 am: 515534ed

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1322708

Change-Id: Id4849079a3d7b15d861b24a98761fe2a9b6ccd94