arm64: dts: qcom: sc7180: Bring back cpufreq-based DDR votes

ChromeOS folks reported that bwmon is too slow and getting rid of
statically defined CPUFREQ-based votes (effectively floor votes because of
how opp-peak-kBps is interpreted), has a major performance impact in some
common applications. Bring them back until MEMLAT support is introduced.

This is a partial revert of the commit referenced in the fixes tag.

Fixes: adc16b84 ("arm64: dts: qcom: sc7180: Hook up BWMONs")
Reported-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230711-topic-7180ddr-v1-1-56e4f13afe9b@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>