ARM: mark mv78xx0 support as deprecated

Only one machine remains supported and was kept in 2022 for the
Debian_on_Buffalo project that was still using this, with plans to
convert it to devicetree.

The conversion never happened, and Debian_on_Buffalo does not provide
kernels later than linux-6.1, so it is unlikely to still be useful
for a DT conversion in the future.

Mark the platform for deprecation after the next LTS kernel, which
should give any remaining users a few more years of bugfixes.

Acked-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/all/20221019150410.3851944-6-arnd@kernel.org/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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