hw/arm: Remove 'n800' and 'n810' machines

Remove the 'n800' and 'n810' machine types, which modelled
Nokia internet tablets. These were deprecated in 9.0 and
so we can remove them for 9.2.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240903160751.4100218-26-peter.maydell@linaro.org
[PMM: added removal of arm-n800-machine.c post-review]
9 files changed