power9 patches for Bionic

[Manoj Iyer]

Seth,

IBM has requested the following power9 patches be picked up for bionic. 
Could you please cherry-pick the patches tracked in the following bugs:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762462
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762448

Thanks
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Manoj Iyer
Ubuntu/Canonical
ARM Servers - Cloud
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