VF610 broken by pinctrl: freescale: imx: allow mux_reg offset zero

[Andrew Lunn]

> > Anyway, it looks like -rc1 is going to be broken on VF610 for some boards,
> > because this pin is the Ethernet clock input/output. Please can you get it fixed
> > for -rc2?
> > 
> [Adrian] Sure let me take a look at this.

Hi Adrian

Do you have a fix for this regression yet? I'm happy to test patches.

Thanks
	Andrew