dt-bindings: clock: qcom,mmcc: fix clocks/clock-names definitions

Rather than defining (incorrect) global clocks and clock-names lists,
define them per platform using conditionals. Also, while we are at it,
mark these properties as required for all platforms for which DT files
contained clocks/clock-names for the MMCC nodes from the beginning (in
addition to existing MSM8998 this adds MSM8994, SDM630 and SDM660).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220705112734.1323355-2-dmitry.baryshkov@linaro.org