ARM: dts: axp22x/axp809: Add GPIO controller nodes

These PMICs all contain a GPIO controller. Now that the binding for this
variant is documented, wire up the controller in the device tree.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220916042751.47906-3-samuel@sholland.org


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>