arm64: zynqmp: Define phy-mode in zcu1275-revB

Add missing required phy-mode property.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/fdd98ebd217e005fedde6aa2175449f7ad5555eb.1726219714.git.michal.simek@amd.com
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