pinctrl: sunxi: Add support for the secondary A523 GPIO ports

pinctrl: sunxi: Add support for the secondary A523 GPIO ports

As most other Allwinner SoCs before, the A523 chip contains a second
GPIO controller, managing banks PL and PM.
Use the newly introduced DT based pinctrl driver to describe just the
generic pinctrl properties, so advertise the number of pins per bank
and the interrupt capabilities. The actual function/mux assignment is
taken from the devicetree.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/20250306235827.4895-9-andre.przywara@arm.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>