[U-Boot] env: tool: add command line option to input lockfile path

[Tom Rini]

On Mon, Sep 26, 2016 at 06:24:08PM +0530, B, Ravi wrote:

> The default lockname is set to /var/lock. This limits the
> usage of this application where OS uses different lockfile
> location parameter.
> For example, In case of android, the default lock
> path location is /data.
> Hence by providing the command line option to input lockfile
> path will be useful to reuse the tool across multiple
> operating system.
> 
> usage: ./fw_printenv -l <lockfile path>
> 
> Signed-off-by: Ravi Babu <ravibabu at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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