modify flash and sdram config.

Signed-off-by: Jianzheng Zhou <water.zhou2011@gmail.com>
add u-boot-1.1.6 original version.

Signed-off-by: Jianzheng Zhou <water.zhou2011@gmail.com>
define CONFIG_SKIP_LOWLEVEL_INIT to avoid double init.

In fact it has been done by loader.bin

Signed-off-by: Jianzheng Zhou <water.zhou2011@gmail.com>
add u-boot-1.1.6

Signed-off-by: Jianzheng Zhou <water.zhou2011@gmail.com>