i2c: designware: Support use in SPL
Allow this driver to set up an IO address in SPL using an 'early-regs' property. This allows SPL to use the I2C driver without having to enable the full PCI stack. Also split out ofdata_to_platdata in designware driver since this is more correct, and more convenient for the new logic. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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