arm64: versal: Remove description for USB1

There is only one USB controller that's why remove description for USB1.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/f148161ee489d19d708df1b4fa7477821e06bb55.1727694230.git.michal.simek@amd.com
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