[automerger skipped] Merge "Remove ndk_platform backend. Use the ndk backend." into sc-dev-plus-aosp am: 5e6543130b am: bc35718b86 am: dc306be2a4 -s ours

am skip reason: Merged-In Id16039722fd70d4e2e934a0988f13a768ce833ec with SHA-1 dd1dbe6913 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/15498074

Change-Id: I74d4f6ae422cf83e06ebe16b134961f603d69ae7