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Dedupe I2C, SPI, UART driver inclusions (#22253)

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Ryan 2023-10-13 17:25:32 +11:00 • committed by GitHub
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docs/i2c_driver.md
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The I2C Master drivers used in QMK have a set of common functions to allow portability between MCUs.
## Usage :id=usage
In most cases, the I2C Master driver code is automatically included if you are using a feature or driver which requires it, such as [OLED](feature_oled_driver.md).
However, if you need to use the driver standalone, add the following to your `rules.mk`:
```make
I2C_DRIVER_REQUIRED = yes
```
You can then call the I2C API by including `i2c_master.h` in your code.
## I2C Addressing :id=note-on-i2c-addresses
All of the addresses expected by this driver should be pushed to the upper 7 bits of the address byte. Setting