I2C clock fix backport#16

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pennam wants to merge 6 commits intoarduino:portenta-mbed-6.2.0from

pennam:i2c_clock-6.2.0

Commits on Mar 26, 2021

STM32: Compute I2C timing according current I2C clock source and required I2C clock

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Use the proper clock source for any I2C instance

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Increase FLAG_TIMEOUT to avoid misleading triggers

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code style fix

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manage I2C_IP_VERSION_V1 boards builds

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Fixed __HAL_RCC_GET_I2C4_SOURCE() if RCC_VER_2_0 is used

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