dt-bindings: usb: samsung,exynos-usb2: convert to dtschema

Convert the Samsung Exynos SoC USB 2.0 EHCI and OHCI Controller bindings
to DT schema format.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220302190938.6195-3-krzysztof.kozlowski@canonical.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>