arm64: virtconfig: Further shrink the config

After disabling platform support there's still some more pruning we can
do to the virtconfig size, there are a number of drivers and subsystems
which are not likely to be useful on mach-virt and so can be disabled in
order to further improve build times. Let's do so, noting that having PCI
device assignment means that PCI devices might potentially appear.

This is just an initial manual passthrough, there will be further savings
available especially if we take a much more focused approach.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230221-arm64-virtconfig-slim-v1-1-604b64be7ec3@kernel.org


Signed-off-by: Arnd Bergmann <arnd@arndb.de>