arm64: dts: qcom: msm8916: add clocks to the GCC device node

As we are converting this platform to use DT clock bindings, add clocks
and clock-names properties to the MMCC device tree node.

Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220704172453.838303-8-dmitry.baryshkov@linaro.org