pinctrl: denverton: Replace MODULE_ALIAS() with MODULE_DEVICE_TABLE()

As Krzysztof pointed out the better is to use MODULE_DEVICE_TABLE()
as it will be consistent with the content of the real ID table of
the platform devices.

Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>