Installation guide architecture table update

[Karsten Merker <merker@debian.org>]

Hello,

I have pushed some updates to the architecture table in the
installation guide for stretch, based on the available flavors in the
current kernel package builds, currently-built d-i targets, information
in wiki.d.o and data from the architecture qualification status page
(https://release.debian.org/stretch/arch_qualify.html). The result
is available at:

https://jenkins.debian.net/userContent/installation-guide/installation-guide-armhf/en/ch02s01.html#idm189

I am not particularly familiar with the state of affairs on mips/mipsel
and powerpc, so it would be nice if the mips/mipsel and powerpc porters
could take a look and let me know if something is wrong or missing.

I haven't listed mips64el in the table as it is not yet confirmed
as a release architecture for Stretch on release.debian.org.

For powerpc it would be nice to have some information about which kind
of systems are still supported as the previously-existing pmac and prep
flavors don't get built anymore.  Is CHRP the only remaining powerpc
platform?

For mipsel, the kernel builds loongson-2e and loongson-2f flavors, but
we don't seem to build any installer images for them.  I dimly remember
having heard something about loongson-2 support being phased out - can
somebody provide information on that?

Regards,
Karsten
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