arm64: dts: allwinner: h616: Add 32K fanout pin

arm64: dts: allwinner: h616: Add 32K fanout pin

On some boards the designers saved on a 32KHz crystal for some external
chips, so the SoC has to help out, with providing a 32 KHz clock signal.

Add a pinctrl group node to allow DT nodes to reference this fanout signal.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240209115759.3582869-2-andre.przywara@arm.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>