dt-bindings: mmc: mmci: Add st,stm32mp25-sdmmc2 compatible

For STM32MP25, we'll need to distinguish how is managed the delay block.
This is done through a new comptible dedicated for this SoC, as the
delay block registers are located in SYSCFG peripheral.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230619115120.64474-2-yann.gautier@foss.st.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>