hw/net/can: clean-up unnecessary includes

hw/net/can: clean-up unnecessary includes

The event_notifier, thread and socket includes look like copy and
paste of standard headers. None of the canbus devices use chardev
although some relied on chardev to bring in bitops and byte swapping
headers. In this case include them directly.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20241209100635.93243-1-alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>