[U-Boot] README: document CONFIG_ENV_IS_IN_SPI_FLASH

[Tom Rini]

On Tue, Jul 01, 2014 at 07:30:13PM +0800, Wu, Josh wrote:

> The option can be used to save the environment in spi flash.
> Implementation code is already exist in command/env_sf.c. But
> the documentation is missing.
> 
> This patch add the details for this option to the README file.
> 
> Signed-off-by: Josh Wu <josh.wu at atmel.com>
> Reviewed-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>

Applied to u-boot/master, thanks!

-- 
Tom
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