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

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

Change-Id: I1ca6e932e4560f89e10c61bf098b4d122b445968