Removal of POWER4 support

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hi Michael!

I was just pointed at your pull request to remove POWER4 support from the
kernel and I'm stumped. POWER4 is something that people are still actively
using.

I'm not aware of any breakage you are mentioning, we have multiple machines
running 4.15 kernels on older PPC64 machines without any issues.

Please keep in mind that IBM isn't the sole manufacturer of POWER machines
but there are also people running PPC64 Linux on embedded PPC64 machines
with Freescale CPUs for example.

Thanks,
Adrian

--
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
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