The ndk_platform backend will soon be deprecated because the ndk backend
can serve the same purpose. This is to eliminate the confusion about
having two variants (ndk and ndk_platform) for the same ndk backend.
Bug: 161456198
Test: m
Merged-In: Icc9af3798ac89742fa56b1cb37d8116d99b4a9c2
Change-Id: Icc9af3798ac89742fa56b1cb37d8116d99b4a9c2
(cherry picked from commit 5cc5d52bd7)