dt-bindings: sram: sunxi-sram: Clean up the compatible lists

Use enumerations where appropriate to combine "const" choices and
deduplicate fallback compatible strings.

Suggested-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jernej Skrabec <[email protected]>

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