[PATCH] serial_lpuart: make clock failure less verbose

[sbabic at denx.de]

> Some device may enable CONFIG_CLK but not still support this clock in
> CC, so better use debug() in place of dev_warn() otherwise a lot of
> boards will throw useless dev_warn()s.
> Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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