[PATCH v1] clk: imx6ul: fix "failed to get parent" error

[Stephen Boyd]

Quoting Oleksij Rempel (2023-03-10 08:45:23)
> On some configuration we may get following error:
> [    0.000000] imx:clk-gpr-mux: failed to get parent (-EINVAL)
> 
> This happens if selector is configured to not supported value. To avoid
> this warnings add dummy parents for not supported values.
> 
> Fixes: 4e197ee880c2 ("clk: imx6ul: add ethernet refclock mux support")
> Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
> ---

Applied to clk-fixes