manifest: Add irqbalance

Pulled from RHCOS, but with the correct architecture conditionals
here, as well as some background links.

fedora-coreos-base.yaml

@@ -172,3 +172,16 @@ packages:
   - fedora-coreos-pinger
   # Parsing/Interacting with JSON data
   - jq
+
+# This thing is crying out to be pulled into systemd, but that hasn't happened
+# yet.  Also we may want to add to rpm-ostree something like arch negation;
+# basically right now it doesn't exist on s390x.
+# Anyways, it was requested by the Red Hat perf team for RHCOS, so we have it here.
+# https://serverfault.com/questions/513807/is-there-still-a-use-for-irqbalance-on-modern-hardware
+# https://access.redhat.com/solutions/41535
+packages-x86_64:
+  - irqbalance
+packages-ppc64le:
+  - irqbalance
+packages-aarch64:
+  - irqbalance