Update cpufreq.c

msm: clock-krait-8974: User voltage control for msm-cpufreq device
Update clock-krait-8974.c

msm: clock-krait-8974: User voltage control for msm-cpufreq device
Update cpufreq.c

msm: clock-krait-8974: User voltage control for msm-cpufreq device
Update Kconfig

msm: clock-krait-8974: User voltage control for msm-cpufreq device