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

[Wolfram Sang]

> Due to clock stretch, our HW IP cannot meet the ac-timing
> spec(tSU;STA,tSU;STO). 
> There isn't a same delay for clock stretching, so we need pass a
> parameter which can be found through measurement to meet most
> conditions.

What about using this existing binding?

- i2c-scl-internal-delay-ns
        Number of nanoseconds the IP core additionally needs to setup SCL.

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