lisa._assets.kmodules.sched_tp: Add sched_pelt_thermal trace event

The corresponding trace point is already supported in Linux kernel
mainline:

Commit 77cf151b7bbdf ("sched/core: Export pelt_thermal_tp")
Commit 765047932f153 ("sched/pelt: Add support to track thermal pressure")

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>