Description of problem:

On a DU node deployed via ZTP flow we can see duplicte' intel_iommu=on iommu=pt' entries in /proc/cmdline.

ssh core.lab.eng.rdu2.redhat.com     'cat /proc/cmdline' 
BOOT_IMAGE=(hd3,gpt3)/ostree/rhcos-9b401531c3ea4339fa17ccc833c28a91c917b6dd04f50ee078703bdbb3abf56f/vmlinuz-4.18.0-305.19.1.rt7.91.el8_4.x86_64 random.trust_cpu=on console=tty0 console=ttyS0,115200n8 ignition.platform.id=metal ostree=/ostree/boot.1/rhcos/9b401531c3ea4339fa17ccc833c28a91c917b6dd04f50ee078703bdbb3abf56f/0 ip=ens2f0:dhcp6 root=UUID=f19b44d7-1c06-4c42-85e8-7f685ff7d78f rw rootflags=prjquota intel_iommu=on iommu=pt skew_tick=1 nohz=on rcu_nocbs=2-23,26-47 tuned.non_isolcpus=03000003 intel_pstate=disable nosoftlockup tsc=nowatchdog intel_iommu=on iommu=pt isolcpus=managed_irq,2-23,26-47 systemd.cpu_affinity=0,1,24,25 default_hugepagesz=1G hugepagesz=1G hugepages=32 idle=poll rcupdate.rcu_normal_after_boot=0 nohz_full=2-23,26-47


Version-Release number of selected component (if applicable):
4.9.0

How reproducible:
not always

Steps to Reproduce:
1. Deploy DU node via ZTP process
siteconfig and policygentemplates are in http://registry.kni-qe-0.lab.eng.rdu2.redhat.com:3000/kni-qe/ztp-site-configs/src/kni-qe-1-4.9, site kni-qe-2


Actual results:
ssh core.lab.eng.rdu2.redhat.com     'cat /proc/cmdline' 
BOOT_IMAGE=(hd3,gpt3)/ostree/rhcos-9b401531c3ea4339fa17ccc833c28a91c917b6dd04f50ee078703bdbb3abf56f/vmlinuz-4.18.0-305.19.1.rt7.91.el8_4.x86_64 random.trust_cpu=on console=tty0 console=ttyS0,115200n8 ignition.platform.id=metal ostree=/ostree/boot.1/rhcos/9b401531c3ea4339fa17ccc833c28a91c917b6dd04f50ee078703bdbb3abf56f/0 ip=ens2f0:dhcp6 root=UUID=f19b44d7-1c06-4c42-85e8-7f685ff7d78f rw rootflags=prjquota intel_iommu=on iommu=pt skew_tick=1 nohz=on rcu_nocbs=2-23,26-47 tuned.non_isolcpus=03000003 intel_pstate=disable nosoftlockup tsc=nowatchdog intel_iommu=on iommu=pt isolcpus=managed_irq,2-23,26-47 systemd.cpu_affinity=0,1,24,25 default_hugepagesz=1G hugepagesz=1G hugepages=32 idle=poll rcupdate.rcu_normal_after_boot=0 nohz_full=2-23,26-47

Expected results:
No duplicate entries in /proc/cmdline

Additional info:
Must-gather available at:
http://registry.kni-qe-0.lab.eng.rdu2.redhat.com:8080/images/must-gather.local.5832368568665900044/