arm64: defconfig: Enable Qualcomm CPUfreq HW driver

The Qualcomm CPUfreq HW provides CPU voltage and frequency scaling on
many modern Qualcomm SoCs. Enable the driver for this hardware block to
enable this functionality on the SDM845 platform.

Tested-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>