i2c: designware: use to_pci_dev()
Use to_pci_dev() instead of open-coding it. Signed-off-by: NGeliang Tang <geliangtang@163.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
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