dt-bindings: usb: samsung,exynos-dwc3: Add Exynos850 support

Exynos850 has dwc3 compatible USB controller, so it can reuse existing
dwc3 glue layer. Document a new compatible for Exynos850 and its clocks.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20230819031731.22618-2-semen.protsenko@linaro.org
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>