[RESEND] i2c: mediatek: Get device clock-stretch time via dts

[Wolfram Sang]

> tSU,STA/tHD,STA/tSU,STOP maybe out of spec due to device
> clock-stretching or circuit loss, we could get device
> clock-stretch time from dts to adjust these parameters
> to meet the spec via EXT_CONF register.
> 
> Signed-off-by: Qii Wang <qii.wang at mediatek.com>

I will look at this next and think about it. New bindings are always a
bit more time consuming.

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