gpio: davinci: Update irq chip data

Use "struct davinci_gpio_controller *chips" as irq chip data to prepare
for immutable irq chip, then it will be easy to get gpio_chip pointer in
irq mask/unmask.

No functional change.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250509-gpio-v1-5-639377c98288@nxp.com


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>