pinctrl: mcp23s08: Drop unused parameter in mcp23s08_probe_one()

The cs parameter in mcp23s08_probe_one() is never used. Drop it for good.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200407173849.43628-4-andriy.shevchenko@linux.intel.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>