Clean up sunxi_defconfig by generating a fresh file via
  make sunxi_defconfig
  make savedefconfig

While this moves around a few lines and removes unnecessary symbols,
it doesn't introduce any functional changes. The resulting .config is
identical before and after this patch.
Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>