pinctrl: sunxi: support moved power configuration registers

pinctrl: sunxi: support moved power configuration registers

The Allwinner pincontroller IP features some registers to control the
withstand voltage of each pin group. So far those registers were always
located at the same offset, but the A523 SoC has moved them (probably to
accommodate all eleven pin banks).

Add a flag to note this feature, and use that to program the registers
either at offset 0x340 or 0x380. So far no pincontroller driver uses
this flag, but we need it for the upcoming A523 support.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/20250306235827.4895-5-andre.przywara@arm.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>