Graphics: Make SurfaceTexture compile-time initializable

Ensure that all static initializer code can be executed in the
compiler. Move native field caching into the native method
registration function.

Bug: 34956610
Test: m
Test: Device boots (Pixel)
Change-Id: Icf68c8fbadcaaa133a152942a3a7ba7aba84a1df

graphics/java/android/graphics/SurfaceTexture.java

@@ -403,11 +403,4 @@ public class SurfaceTexture {
     private native int nativeGetQueuedCount();
     private native void nativeRelease();
     private native boolean nativeIsReleased();
-
-    /*
-     * We use a class initializer to allow the native code to cache some
-     * field offsets.
-     */
-    private static native void nativeClassInit();
-    static { nativeClassInit(); }
 }