Move Aidl utility code to aidl/utils -- hal 1/2 am: 8fa5383407 am: 937d71b102 am: 4b45b7b234 am: f8eee4fe1b am: cb1285dc8c

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1878018

Change-Id: I7d695306a8906ce4acd16da67a5a6bc903415113