enable CMA https://github.com/linux-sunxi/linux-sunxi/commit/e01d8fb11c39d5c0b75f9581ee9127cc9b4b1c51 and set CMA size to 192MB as recommended by ssvb https://github.com/linux-sunxi/linux-sunxi/commit/25a40e1198c4019fefd1d14275b0f13c979d0f08
compile cedar as loadable modules modname sunxi_cedar_mod