spi: sun6i: change OF match data to a struct

As we're adding more properties to the OF match data, convert it to a
struct now.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maksim Kiselev <bigunclemax@gmail.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20230510081121.3463710-3-bigunclemax@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>