I2C Controller mode does not support transactions longer than 255 bytes

[astapleton]

The current implementation does not support transactions longer than 255 bytes as it doesn't use the I2C reload functionality internally to write out buffers longer, but does allow for multiple consecutive HAL Operations of the same type of <255 bytes to be made. This should be fixed so that transfers longer than 255 internally use the I2C reload logic to continue writing from buffers longer than 255 bytes.