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
Change-Id: Ibeb4178f99857be75bb5f83a073a2d679058d921
diff --git a/keystore2/Android.bp b/keystore2/Android.bp
index 64636ac..723c4c9 100644
--- a/keystore2/Android.bp
+++ b/keystore2/Android.bp
@@ -124,8 +124,8 @@
     // be removed once that works correctly.
     shared_libs: [
         "android.hardware.confirmationui@1.0",
-        "android.hardware.security.sharedsecret-V1-ndk_platform",
-        "android.security.compat-ndk_platform",
+        "android.hardware.security.sharedsecret-V1-ndk",
+        "android.security.compat-ndk",
         "libc",
         "libdl_android",
         "libdl",