qcom-cpufreq: Rename cpufreq_suspend to suspend_data

cpufreq_suspend is now a function in core CPUfreq framework. Rename
qcom-cpufreq's local per-cpu variable to suspend_data.

Change-Id: I2f567f0c04271d728d4e6a17b61cea2152c4d8f7
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>