Support for GL config in LWP, fallback to RGB565 if config not found.

* Current LWP backend doesn't pass though the application config/GL config. -> made it read the config.

* GDXEGLconfigchooser currently returns null if you ask for a config that isn't available, so just return RGB565 if requested config is not found.

I commented out the code about the GT-I7500 since it seems to have been removed from the AndroidGraphics counterpart code and checked for elsewhere: https://github.com/Opotech/libgdx/blob/gdxclean/backends/gdx-backend-android/src/com/badlogic/gdx/backends/android/AndroidGraphics.java#L260