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: Id17572137091b295457dc98fdd1742da0983e738

gnss/47765/Android.bp

@@ -42,7 +42,7 @@ cc_prebuilt_library_shared {
                 "android.hardware.gnss@2.1",
                 "android.hardware.gnss.measurement_corrections@1.0",
                 "android.hardware.gnss.visibility_control@1.0",
-                "android.hardware.gnss-V1-ndk_platform",
+                "android.hardware.gnss-V1-ndk",
                 "libhardware",
                 "libc++",
                 "libc",