defconfig: msm9625: Enable CPU FREQ

CPUFreq provides the capability to scale CPU frequency based on CPU
activity which is useful for power saving. Enable CPUFreq support
since acpuclock driver is ready.

Change-Id: If657b2a7ec63eb7c06cf00d22b2cd3d6bb964f3e
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>