pinctrl: broxton: No need to take pointer of a pointer

There is no need to take pointer of a pointer to an array of SoC data in
platform driver.

Do it in the same way as it's done for ACPI.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>