lisa: Make LISA compatible with sched_pelt_cfs event
lisa: Make LISA compatible with sched_pelt_cfs event

Since sched_load_cfs_rq is now available in mainline Linux as sched_pelt_cfs,
use the new name, and still accept the old one in the load_tracking analysis.

ARM-software/lisa,credp/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa