[RESEND PATCH] gpio: rgpio2p: Enhance reading of GPIO pin value

[sbabic at denx.de]

> Add support for reading GPIO pin value when function is output.
> With this patch applied, gpio toggle command is working.
> Signed-off-by: Christoph Fritz <chf.fritz at googlemail.com>
> Reviewed-by: Peng Fan <peng.fan at nxp.com>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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