msm: hotplug: Update default fast_lane_load

A value of 99% load catches almost all spikes and keeps spurious
onlinings to an absolute minimum.

Replace all instances of cputime64_t by u64 (see upstream commit
72a4ce340a7ebf39e1c6fdc8f5feb4f974d6c635).
Fix cpufreq_stats.c Use u64 instead cputime64_t

https://github.com/torvalds/linux/commit/1e7586a18a2ab69a160837c0a4be31f7147cfb5e
MSM HOTPLUG: change global DEFAULT_MAX_CPUS_ONLINE to stats.total_cpus