[automerger skipped] Remove ndk_platform backend. Use the ndk backend. am: 2693757b63 -s ours

am skip reason: Merged-In I14a1c57bd06f1f2aa52491f779c7030d4de03547 with SHA-1 78901b9ff5 is already in history

Original change: https://android-review.googlesource.com/c/platform/hardware/google/pixel/+/1788154

Change-Id: Ib3add5564057415ef6f968d017deb806de48c397