[U-Boot] Update the rootfs type to ext4 for Overo and Pepper

[Tom Rini]

On Mon, Jul 20, 2015 at 11:50:40AM -0700, Adam YH Lee wrote:

> Gumstix is migrating from ext3 to ext4 file system.
> 
> Signed-off-by: Adam YH Lee <adam.yh.lee at gmail.com>
> Acked-by: Ash Charles <ashcharles at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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