dt-bindings: usb: exynos-usb: Document clock names for DWC3 bindings

The Exynos DWC3 driver expects certain clock names, depending on used
compatible.  Document this explicitly in the bindings.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
1 file changed