dt-bindings: mailbox: qcom: add missing platforms to conditional clauses

Add missing platforms to the conditional clauses selecting whether the
clocks/clock-names properties are required or whether they must be
omitted.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>