Merge "Use platform prebuilts from NDK r23 canary." am: c6e03adb1f am: e6c7e73d79 am: a44ef745ba

Original change: https://android-review.googlesource.com/c/platform/prebuilts/ndk/+/1645879

Change-Id: I24d738d75af3f2ac5ed0fbdc355c5cf0cadabc1d
tree: 08e89999cfabea1366731c0ff099c7f68652edc1
  1. r21/
  2. r23/
  3. Android.bp
  4. Android.mk
  5. CleanSpec.mk
  6. NOTICE
  7. pylintrc
  8. update.py