fix (rp i2c): set i2c slew rate to spec value #2038
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The RP2040 datasheet indicates that I2C pins should have a limited slew rate (Page 440 - 4.3.1.3.). This configures that for both `I2c` and `I2cSlave`. In addition, the pin configuration has been centralized to a single fn.
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The RP2040 datasheet indicates that I2C pins should have a limited slew rate (Page 440 - 4.3.1.3.). This configures that for both
I2candI2cSlave.In addition, the pin configuration has been centralized to a single fn.