kernel source files for pcDuino

The build enviroment copy from: https://github.com/linux-sunxi/sunxi-bsp.git https://github.com/linux-sunxi/allwinner-tools.git

submodules: https://github.com/linux-sunxi/u-boot-sunxi.git https://github.com/linux-sunxi/sunxi-tools.git https://github.com/linux-sunxi/linux-sunxi.git https://github.com/linux-sunxi/cedarx-libs.git