Remove ndk_platform backend. Use the ndk backend.

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: I0652f1efe920111d79dd8c2ecd52e55dda54538f
Merged-In: Ib58c9f1cb80d083a3c62d03415610be855b80f03
Change-Id: Ied92f2784ed7d6a73693c640042c8a66fbbcfa17