Fix cpufreq error
msm: acpuclock: Fix acpuclk_get_rate

acpuclk_get_rate() is broken, quick fix it by returning msm_cpufreq_get_freq
to avoid regressions.

Change-Id: I148bd9dd46aa34501c164abefa21623500cd5def

Conflicts:
	arch/arm/mach-msm/cpufreq.c