dt-bindings: iommu: apple,sart: Add apple,t8112-sart compatible string

"apple,t8112-sart" as found on the Apple M2 SoC appears to be SART3 as
well. To allow for later discovered incompatibilities use
'"apple,t8112-sart", "apple,t6000-sart"' as compatible string.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: Hector Martin <marcan@marcan.st>