hw/input/ps2: Convert TYPE_PS2_DEVICE to 3-phase reset

hw/input/ps2: Convert TYPE_PS2_DEVICE to 3-phase reset

Convert the parent class TYPE_PS2_DEVICE to 3-phase reset.  Note that
we need an 'exit' phase function as well as the usual 'hold' phase
function, because changing outbound IRQ line state is only permitted
in 'exit'.  (Strictly speaking it's not supposed to be done in a
legacy reset handler either, but you can often get away with it.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20221109170009.3498451-2-peter.maydell@linaro.org