[PATCH v2] serial: mxs: Add MXS AUART driver

[sbabic at denx.de]

> Add trivial driver for the MXS AUART IP. This is the other UART IP
> present in i.MX23 and i.MX28, used to drive the non-DUART ports.
> Signed-off-by: Marek Vasut <marex at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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