[Skyeye-developer] patch for nandflash simulation

[gbf0871]

加入对nandflash的模拟，目前只实现了smallblock类型的flash和s3c2410的
nandflash控制器。
另外修改了cs8900的部分代码，使u-boot中的tftp可用。
test.tar.bz2是测试,用法如下
./skyeye     //启动到u-boot
# nand read 0x30000000 0x30000 0x110800  //从nand中读去linux
# bootm 0x30000000                       //引导 linux

在u-boot下，可用 nand write.yaffs1 命令些入yaffs镜像（已写入)

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