ANDROID: update_group_capacity for single cpu in cluster

If we're only left with one big CPU in a cluster (either there was only
one to begin with or the others have been hotplugged out), the MC level
seen from the perspective of that CPU, will only contain one group (that
of the CPU) and the LOAD_BALANCE flag will be cleared at that level.
The MC level is kept nonetheless as it will still contain energy
information, as per commit 06654998ed81 ("ANDROID: sched: EAS & 'single
cpu per cluster'/cpu hotplug interoperability").

This will result in update_cpu_capacity never being called for that big
CPU and its capacity will never be updated. Also, its capacity will
never be considered when setting or updating the max_cpu_capacity
structure.

Therefore, call update_group_capacity for SD levels that do not have the
SD_LOAD_BALANCE flag set in order to update the CPU capacity information
of CPUs that are alone in a cluster and the groups that they belong to.
The call to update_cpu_capacity will also result in appropriately
setting the values of the max_cpu_capacity structure.

Fixes: 06654998ed81 ("ANDROID: sched: EAS & 'single cpu per cluster'/cpu
hotplug interoperability")
Change-Id: I6074972dde1fdf586378f8a3534e3d0aa42a809a
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>