arm64: defconfig: Enable Qualcomm MSM8996 CPU clock driver

The MSM8996 supports CPU frequency scaling, so enable the clock driver
for this.

Acked-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210804193042.1155398-1-bjorn.andersson@linaro.org


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