dt-bindings: mmc: meson-gx: fix interrupt binding

Reflect in the binding that the cd interrupt is optional,
and add a description of the interrupts.

Fixes: 09b31a610328 ("dt-bindings: mmc: meson-gx: support specifying cd interrupt")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/c1437eb6-0c01-809f-422b-cb1109489355@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

dt-bindings: mmc: meson-gx: support specifying cd interrupt

Support passing a second interrupt as card detect interrupt.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/1c5996a5-491f-39d6-b120-bbef86473729@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

dt-bindings: mmc: convert amlogic,meson-gx.txt to dt-schema

Convert the Amlogic SD / eMMC controller for S905/GXBB family SoCs
to dt-schema.

Take in account the used variant with amlogic,meson-gx-mmc.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221117-b4-amlogic-bindings-convert-v3-6-e28dd31e3bed@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>