- support VR4122 ICU register map.
- support VR4122 intr levels.
XXX: currently if 'options VR4122' is defined,
XXX: cannot specify 'options VR4121','options VR4111', 'options VR4102'.
XXXX: i have not the VR4122 based hardware.. so no check for VR4122.
- just copy from bivideo.
- erase WindowsCE hardware cursor initialy.
- LCD power management codes exist, but currently disabled.
Because some devices(include ite8181) confuse after LCD power turn on.
WorkPad z50 power unit seem to be very weak