Add irqbalance under project-edgeOS

The irqbalance from portage-stable does not allow
EnvironmentFile to set IRQBALANCE_BANNED_CPULIST at
runtime and start/stop irqbalance.
This is needed to balance IRQs away from the IsolCPUs

BUG=b/342201413

TEST=emerge-gmec-amd64-hw sys-apps/irqbalance
RELEASE_NOTE=None

Change-Id: Ieaca5efa725dfccca519cb403abb156d20a6050d
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/78519
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Alan Berryhill <berryhill@google.com>
7 files changed