Fix SetConfig implementation for STM32 I2C v2 #3928
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The I2C peripheral needs to be disabled to change the timings register. This PR fixes the
SetConfigimplementation to disable the peripheral, set the timings, then re-enable it.I took a glance at the v1 I2C implementation to see if this might be easy to add there, but that peripheral is sufficiently different that I did not feel comfortable changing it without a device to test on, which I don't have.
Fixes #3914.