Update - Tried Both these options.
1) Adding pcie_aspm=off to kernel parameters
2) adding pci=noaer to kernel parameters.
Doing either stops IRQ process hogging the CPU. Planning to go with 
pcie_aspm=off.
Thank you.
https://askubuntu.com/uquestions/863150/pcie-bus-error-severity-corrected-type-physical-layer-id-00e5receiver-id
  
https://askubuntu.com/questions/771899/pcie-bus-error-severity-corrected

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https://bugs.launchpad.net/bugs/1880653

Title:
  irq/126-aerdrv always eating 30-40 % of a CPU core

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