drivers: gpio: mmio32: Make GPIO_MMIO32_INIT dt aware

Change the GPIO_MMIO32_INIT to take a devicetree node since we want
to use DEVICE_DT_DEFINE.  This makes it so that code using
GPIO_DT_SPEC_GET works correctly with GPIO controllers that utilize
GPIO MMIO32.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
3 files changed