hw/arm: Remove pxa2xx.c

hw/arm: Remove pxa2xx.c

All the callers of pxa270_init() and pxa255_init() have now been removed,
so we can remove pxa2xx.c. This also removes the only uses of a lot of
pxa2xx specific devices, which will be removed in subsequent commits.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240903160751.4100218-16-peter.maydell@linaro.org