[U-Boot] common: Add support for environment file in EXT4.

[Tom Rini]

On Tue, Feb 23, 2016 at 03:51:26PM +1000, Stuart Longland wrote:

> From: Stuart Longland <stuartl at vrt.com.au>
> 
> This is an enhancement that permits storing the environment file on an
> EXT4 partition such as the root filesystem.  It is based on the existing
> FAT environment file code.

Applied to u-boot/master, thanks!

-- 
Tom
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