Add sysprop stub for product am: 6b842c7e86 am: ee1744bf1d am: 63f229d3d7 am: 3426f8c98b

Original change: https://android-review.googlesource.com/c/platform/system/tools/sysprop/+/1465915

Change-Id: Iffd18cd79d1db7299336457f41166758b7cf3773