mmc: zynq: Sync with upstream DT binding

Versal NET is not in production yet that's why no need to keep backward
compatible with previously used compatible string.

Link: https://lore.kernel.org/r/20230403102551.3763054-2-sai.krishna.potthuri@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/0d355f4fbaf6a3521d41ee43f17dde2515ff7ab7.1684311766.git.michal.simek@amd.com
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