i2c: Add I2C Controller implementation #27
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This adds the I2C Controller driver implementation for the STM32H5. It implements a blocking, and non-blocking API, as well as the embedded-hal 1.0 traits.
It borrows a lot from the STM32H7 HAL (particularly the TIMINGR configuration, which is a bit inscrutable in the reference manual), but it borrows the
Instanceconcept from the STM32F4 project to minimize the need for macros.It uses the updated terminology of Controller/Target from the latest version of the I2C spec (Rev. 7.0)