cpufreq: qcom-hw: Allocate qcom_cpufreq_data during probe

qcom_cpufreq_data is allocated based on the number of frequency domains
defined in DT which is static and won't change during runtime. There is
no real reason to allocate it during the CPU init() callback and deallocate
it during exit(). Hence, move the allocation to probe() and use the
allocated memory during init().

This also allows us to use devm_platform_get_and_ioremap_resource() helper
for acquiring the freq-domain resources from DT.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>