dt-bindings: sram: sunxi-sram: Add A523 compatible

The Allwinner A523 family of SoCs have their "system control" registers
compatible to the A64 SoC, so add the new SoC specific compatible string.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Yixun Lan <dlan@gentoo.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250430-01-sun55i-emac0-v3-1-6fc000bbccbd@gentoo.org


Signed-off-by: Chen-Yu Tsai <wens@csie.org>