hw/input/ps2.c: Convert TYPE_PS2_{KBD, MOUSE}_DEVICE to 3-phase reset

Convert the child classes TYPE_PS2_KBD_DEVICE and
TYPE_PS2_MOUSE_DEVICE to the 3-phase reset system.  This allows us to
stop using the old device_class_set_parent_reset() function.

We don't need to register an 'exit' phase function for the
subclasses, because they have no work to do in that phase.  Passing
NULL to resettable_class_set_parent_phases() will result in the
parent class method being called for that phase, so we don't need to
register a function purely to chain to the parent 'exit' phase
function.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20221109170009.3498451-3-peter.maydell@linaro.org

include/hw/input/ps2.h

@@ -36,7 +36,7 @@
 struct PS2DeviceClass {
     SysBusDeviceClass parent_class;
 
-    DeviceReset parent_reset;
+    ResettablePhases parent_phases;
 };
 
 /*