[automerger skipped] Remove internal props from api txt files am: 23819ab937 am: 73a7492b21 am: fffd9198d2 am: 9e01911961 -s ours

am skip reason: Change-Id I32d6ee3235a699f5160644b9e1b43d9cf0da61fc with SHA-1 656ac0fd59 is in history

Original change: https://android-review.googlesource.com/c/platform/system/tools/sysprop/+/1461744

Change-Id: Id7498fea978698af63e224aadc07933d689a4574