dt-bindings: arm: amlogic: remove unstable remark

Amlogic bindings were marked as work-in-progress / unstable in 2017 in
commit 7e8634e8 ("dt-bindings: amlogic: add unstable statement").
Almost seven years is enough, so drop the "unstable" remark and expect
usual ABI rules.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240224084030.5867-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>