[riot-notifications] [RIOT-OS/RIOT] cpu/nrf52: Add i2c reconfigure feature (#15527)

Lena notifications at github.com
Mon Nov 30 16:58:04 CET 2020

### Contribution description
This PR adds the i2c reconfigure feature to the nrf52 cpu.

### Testing procedure
1. Run the `tests/periph_i2c` test application.
`i2c_gpio` command should available and usable.

2. Connect a Microchip CryptoAuth device to the board with nrf52 cpu and change default i2c_speed in `boards/common/nrf52/include/cfg_i2c_default.h` to `I2C_SPEED_FAST`. When  the feature is provided in `cpu/nrf5x_common/Makefile.features` the application should execute successfully. If the feature is removed from `Makefile.features`, the execution should fail.
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-- Commit Summary --

  * cpu/nrf52: Add i2c reconfigure for use with CryptoAuth devices

-- File Changes --

    M cpu/nrf52/include/periph_cpu.h (3)
    M cpu/nrf52/periph/i2c.c (25)
    M cpu/nrf5x_common/Makefile.features (2)

-- Patch Links --


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