Merge "Remove ndk_platform backend. Use the ndk backend." into sc-dev-plus-aosp am: 21bf757c99

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15472407

Change-Id: I6c76d2e9694031c3e56704ef6e29b7a629c3d7e5