arm64: dts: qcom: msm8992: Use the correct MMCC compatible

Now that proper msm8992 support is in the driver, switch to
the new compatible.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220319174645.340379-8-konrad.dybcio@somainline.org