[U-Boot] db820c: add dummy clock for uart node

[Tom Rini]

On Tue, May 29, 2018 at 12:30:45AM +0300, Ramon Fried wrote:

> The missing clock causes serial_msm driver probe to fail.
> Added a dummy node so the probe succeeds, as the clock init
> currently in db820c is empty.
> 
> Fixes: 11d59fe5374a ("serial: serial_msm: fail probe if settings clocks fails")
> 
> Signed-off-by: Ramon Fried <ramon.fried at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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