dt-bindings: mmc: add Marvell ac5

Add dt bindings for Marvell AC5/X/IM eMMC controller.
This compatibility string covers the differences in the
AC5/X version of the driver: 31-bit bus limitation and
DDR memory starting at address 0x2_0000_0000, which are handled
by usage of a bounce buffer plus a different DMA mask.

Signed-off-by: Elad Nachman <enachman@marvell.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240103172803.1826113-2-enachman@marvell.com


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