arm64: dts: qcom: sm8150: Fix incorrect cpu opp table entry

CPU0 frequency 768MHz is wrongly modeled as 576000000 hz in
cpu0_opp_table. Use the correct value 768000000 hz.

Fixes: 2b6187ab

 ("arm64: dts: qcom: sm8150: Add CPU opp tables")
Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210804132847.2503269-1-thara.gopinath@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>