dt-bindings: usb: generic-ehci: Document clock-names in top-level

Convention is to always have properties defined in top-level part of the
binding and then customized (narrowed per variant) in "if:then:" blocks.
The clock-names were mentioned only in such "if:then:" block for
atmel,at91sam9g45-ehci, thus add the top-level part and disallow usage
of clock-names for other devices.  This has no practical impact as
clock-names are not used by other variants, except in
hisilicon/hi3798cv200.dtsi, but that SoC has it undocumented.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260625091744.109467-3-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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