dt-bindings: mmc: sunxi: Simplify compatible string listing

dt-bindings: mmc: sunxi: Simplify compatible string listing

New Allwinner SoCs only occasionally update their MMC IP, leading to many
pairs of compatible strings, though there are sometimes a number of them
being compatible with one particular SoC.

Collate the compatible string listing in the binding, to group those
being compatible together. This makes the list more readable, and allows
for easier addition of new SoC's MMC devices.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250307005712.16828-2-andre.przywara@arm.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>