ANDROID: Streamline sched_domain_energy_f functions

There is no need to print out if there is no sched group energy for a
sched domain.

It is e.g. perfectly fine to have an Energy Model on MC and DIE level
and not on SYSTEM level.

The Energy Model consistency check between sched domains is done in
init_sched_groups_energy(): In case a sched domain level l has energy
data its child sched domain level has to have energy data too.

Change-Id: Idda1a5f895584ce11c4c7a6a18f7fc577b6ae3f8
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Git-commit: d97484219c9be0ea84a1c3138196e17518420f63
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Puja Gupta <pujag@codeaurora.org>