dt-bindings: crypto: qcom-qce: constrain clocks for SM8150-compatible QCE

All devices compatible with SM8150 QCE (so SM8250 and newer) do not have
clock inputs (clocks are handled by secure firmware), so explicitly
disallow the clocks in the bindings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>